RRB ALP CBAT Guide: Batteries, T-Score, Merit and Practice Plan

You can score very well in CBT-2 and still lose your Assistant Loco Pilot seat in a single sitting of about an hour. The Computer Based Aptitude Test, usually called the psycho test, has no syllabus and no formulas to memorise. It does have a hard cut: fall short in even one battery and you are out, whatever your CBT-2 marks were. This guide covers what the official notices say, what is only reported by third parties, and how to practise for each battery.

RRB ALP CBAT at a Glance

Two recruitment cycles are running side by side, and their rules differ on one important point. The table below is based on the detailed official notices for CEN 01/2025 and CEN 01/2026 published on RRB websites.

Point	CEN 01/2025	CEN 01/2026
Post and pay	Assistant Loco Pilot, Level-2, initial pay Rs. 19,900	Same
Vacancies in notice	9,970 (provisional, may change)	11,127 (provisional, may change)
Who is shortlisted for CBAT	8 times the vacancies per category, on Part-A of CBT-2, if Part-B is qualified	Same
Qualifying score	T-score of at least 42 in each battery separately	Same
Negative marking	None in CBAT	None in CBAT
Language	English and Hindi only	English and Hindi only
Merit weightage	70% CBT-2 Part-A, 30% CBAT	50% CBT-2 Part-A, 50% CBAT
Document needed on CBAT day	Vision Certificate in the prescribed format (Annexure VIA), original	Self Screening Medical Declaration Report, Parts A and B (Annexures VIII A and VIII B), original
Medical standard	A-1	A-1

Many coaching pages mix these two cycles together, which is why you will see 30% on one site and 50% on another. Both are right for their own notification. Find the CEN number on your application and read the rules for that one.

Who Has to Take the CBAT

Every ALP applicant who reaches this stage must take it. There is no exemption. The path is: CBT-1 (screening), CBT-2, then CBAT, then document verification and medical examination.

• Shortlisting for CBAT is done RRB-wise and category-wise.
• The number called is 8 times the ALP vacancies for each category (UR including OBC-CL, OBC-NCL, SC, ST and EWS including ex-servicemen).
• The ranking used is your marks in Part-A of CBT-2, and you must also have qualified Part-B (35% for all candidates).
• If several candidates tie at the cut-off mark, all of them are called.

Part-A has 100 questions in 90 minutes and Part-B has 75 questions in 60 minutes, with one-third negative marking in both. Part-B only qualifies you. Only Part-A marks count for ranking and merit. So the CBAT is not a second academic exam. It is a separate screen for the cognitive and perceptual skills a loco pilot uses on duty.

Being called for CBAT is not a selection. With 8 times the vacancies being tested, most people sitting the test will not be finally selected, and some will not even qualify the batteries. Treat the call letter as a chance, not a result.

Documents and Rules on CBAT Day

The CBAT has paperwork that can stop you at the gate. Under CEN 01/2025 you must carry the original Vision Certificate in the prescribed format, and the notice says candidates without it will not be permitted to appear. Under CEN 01/2026 the equivalent is the Self Screening Medical Declaration Report. During the application you fill a self-screening questionnaire, a report is generated, and it must be signed by a General Physician (Part-A) and an Eye Specialist (Part-B). The notice says the certificate is accepted only if issued by a Central or State Government hospital or a medical college.

Other points from the notices:

• E-call letters are downloaded only from the official RRB website of your RRB, about four days before the exam. The city information comes earlier.
• Requests to change date, shift or centre are not entertained.
• Mobile phones, smart watches, calculators, pens, wallets, belts, shoes with metal and similar items are banned items. Check your e-call letter for the full list and the ID rules.
• Carry a recent colour passport photograph if your e-call letter asks for one (the CEN 01/2026 notice says it should be not older than two months).

Get the medical papers done weeks before the call letter arrives. A government hospital queue on the day before the exam is how a good candidate ends up outside the hall.

The Test Batteries: What Is Official and What Is Reported

The official notices do not list the names of the batteries. They only say that each battery must be cleared separately and point candidates to the RDSO website (Traffic and Psychology, then Psychology, Candidate's Corner) for information on CBAT. Read that page directly. It is the closest thing to an official guide.

Coaching and preparation sites commonly report five batteries for ALP:

1. Memory
2. Following Directions
3. Depth Perception
4. Concentration
5. Perceptual Speed

Some pages list a sixth, a mechanical comprehension battery, and say it may not appear in every zone. Other pages do not mention it. The official CEN text does not confirm it either way. The topic of this guide mentions numerical and mechanical-type tests, but I could not verify either as part of the current ALP CBAT. Do not spend weeks on a mechanical-aptitude book on the strength of one website. Check your e-call letter and the RDSO page, and keep a small buffer of practice time for it just in case.

Durations, number of questions and sub-test names also differ between sources, and I have not found them in an official notice. The descriptions below are therefore the commonly reported task types, not an official list.

How the T-Score and the Qualifying Mark Work

The notice says all candidates, whatever their community, must secure a minimum T-score of 42 in each test battery separately. There is no relaxation for SC, ST, OBC or EWS and no way to make up a low battery with a high one.

A T-score is a standard score, not a percentage. In general psychometric use it is built so that the average performance of the comparison group sits at 50, and each 10 points above or below is one standard deviation. Your raw performance on a battery (how many items you got right, adjusted for how the test is scored) is converted onto that scale. The exact conversion, the comparison group and the raw-score tables used for ALP have not been published in the notices, so treat any claimed formula with caution.

Here is what that means in plain terms. A score of 42 is 0.8 standard deviations below the average. If scores were spread in a bell shape, roughly one in five test-takers would fall below it. That is a general illustration, not RRB data. The practical lesson is simple: the bar is below average, so you do not need to be exceptional, but you cannot afford a weak battery.

Because the test has no negative marking, a guess costs nothing in the sense of marks deducted. Whether an attempted-but-wrong answer is treated differently from an unattempted one inside each battery's scoring is not stated in the notice. Some batteries, as reported, reward accuracy at speed, so random clicking is a risky habit even without a formal penalty.

How CBAT Counts Toward Final Merit

This is where the two notifications differ.

• CEN 01/2025: the merit list is prepared only from candidates who qualify the CBAT. 70% weightage goes to Part-A of CBT-2 and 30% to the CBAT score.
• CEN 01/2026: the merit list is prepared RRB-wise only from CBAT-qualified candidates, with Part-A of CBT-2 and the CBAT score weighted 50:50. Document verification and medical examination candidates, equal to the number of vacancies, are shortlisted on this combined merit and zone and post preferences.

The notices say "score obtained in the CBAT" but do not spell out how the scores of several batteries are combined into one number for merit, or how CBT-2 marks are normalised against it. Do not trust a coaching formula for this. Check the latest notification and any result notice.

What follows is my planning reading, not an official statement. Under a 30% weight, CBAT mostly decides whether you qualify. Under a 50% weight, it can move your rank a lot, so scoring well above 42 matters, not just clearing it. If your cycle is CEN 01/2026, prepare for the CBAT as seriously as for CBT-2 Part-A.

Ties are broken in favour of the older candidate, and under the CEN 01/2026 notice, by alphabetical order of given name if the age is also the same.

Battery-Wise Practice Approach

None of these tests asks for knowledge. They measure how fast and how accurately your attention, memory and spatial sense work. That means practice improves familiarity and speed with the task, which is a real gain, but it will not change who you are overnight. The task descriptions below follow what preparation sources commonly report.

1. Memory Battery

What it tends to involve: you are shown something for a short, fixed time, such as a map or layout with objects in positions, a set of figures, or pairs of pictures and numbers. It then disappears and you answer questions about what you saw. Reported variants include figure position, figure finding and railway-track style memory.

How to practise:

• Do not try to memorise everything. Pick a system in the first seconds, such as scanning left to right, top to bottom, every time.
• Link items to a story or a place. A number next to a picture of a bridge becomes a short sentence in your head.
• Practise with a timer on your phone: look at a page of drawings for the set time, close it, and write down what you remember.
• Check your errors. If you mix up positions, work on position. If you forget items, work on chunking them into groups of three or four.

2. Following Directions Battery

What it tends to involve: a table or grid of letters or numbers, or something like a clock face, and a set of written instructions to apply in order. The question asks where you end up or which item matches. As reported, it checks how well you carry out multi-step instructions without losing your place.

How to practise:

• Use your finger or the mouse pointer to trace each step. Do not do two steps in your head at once.
• Read the whole instruction once, then execute it one step at a time.
• Take a printed grid and write your own five-step instruction sets. Solve each, then have a family member check.
• Slow down at the turns. Left and right mix-ups after a direction change are the most common loss of marks.

3. Depth Perception Battery

What it tends to involve: pictures of three-dimensional stacks of bricks or cubes. You have to judge things such as how many bricks touch a marked brick, or how many hidden blocks lie behind the visible ones. It tests how well you read a flat image as a solid object.

How to practise:

• Build the real thing. Stack 10 to 15 small blocks or even matchboxes and look from different angles. This is the fastest way to learn the logic.
• Learn the rules for hidden blocks. If a visible column is three high, there must be support below it.
• Count in a fixed order, layer by layer, from the bottom.
• When two views conflict, trust the ones with edges you can see clearly, and skip the unclear question to come back later.

4. Concentration Battery

What it tends to involve: long, repetitive checking. Examples reported include comparing two numbers and marking whether they are identical or different, searching for a target digit in a block of digits, and yes-or-no matching tasks. The difficulty is staying accurate for a long run, not the difficulty of any one item.

How to practise:

• Build stamina with daily timed drills of 10 to 15 minutes and slowly extend them.
• Keep your eyes moving along a line with a steady rhythm. Do not look back at the previous row.
• When you notice a drop in attention, take one slow breath and keep going. Do not stop to think about the mistake.
• Practise this one when you are slightly tired as well, since the real test may be late in the day.

5. Perceptual Speed Battery

What it tends to involve: quickly spotting which shape, symbol or figure matches or differs from a reference, across many items under a tight clock. Some sources say the battery rewards a high attempt count combined with high accuracy, though the notice does not state a rule.

How to practise:

• Find the one feature that separates the choices, such as a missing line or a flipped part, and look for that first.
• Measure two numbers in every practice session: how many you attempted and how many were right. Improve both, not just one.
• Keep your pace even. A burst of fast guesses followed by a long pause is worse than a steady speed.

If a Mechanical or Numerical Battery Appears

If your e-call letter or the RDSO page lists a mechanical comprehension battery, expect everyday physics-style questions about levers, gears, pulleys and simple machines. Your Basic Science and Engineering preparation for CBT-2 Part-A (units, work, power and energy, levers and simple machines) already covers the base. A short weekly revision is enough unless the official page says otherwise. Do not assume a separate numerical battery exists without confirmation.

A 4-Week CBAT Practice Plan

This is my own planning suggestion, not an official schedule. It assumes 45 to 60 minutes a day, six days a week, and one lighter day. If your CBAT date is closer, compress weeks 1 and 2 and keep weeks 3 and 4 as they are. The call letter timing varies, so start the plan as soon as you clear CBT-2 Part-A, or even earlier.

Week 1: Learn the Tasks

• Read the RDSO Candidate's Corner material and any official sample instructions first.
• Try each battery type once, untimed, only to understand the rules.
• Days 1 to 5: one battery per day, 30 minutes of learning the task and 20 minutes of easy practice.
• Day 6: revisit the two batteries that felt hardest.
• Keep a small notebook with one line per session: what went wrong and why.

Week 2: Build Accuracy

• Practise each battery at a comfortable pace and aim for correctness first.
• Memory and Following Directions get extra time, because mistakes there come from method.
• Add the block-stacking exercise for Depth Perception on at least three days.
• End each session by reviewing every wrong answer. Ask whether it was a misread, a lapse of attention or a wrong method.

Week 3: Add the Clock

• Switch to timed sets. Reduce the time limit by small steps each day.
• Concentration and Perceptual Speed drills grow from 10 minutes to 20 minutes.
• Record attempted and correct numbers for every timed drill and look at the trend across the week.
• Do one mixed session, with three or four batteries back to back, to test how your attention holds across tasks.

Week 4: Simulate and Rest

• Do two or three full simulations of five batteries in sequence, at the time of day your exam is likely to be.
• Fix only your weakest battery. Do not try to fix everything now.
• In the last two days, do light practice only, at about half the normal load.
• Prepare documents, travel and sleep. A rested brain beats one more drill.

Keep revising CBT-2 related topics lightly if your CBT-2 result is still pending. Do not drop the written exam preparation for the CBAT until you know where you stand.

How to Prepare at Home

You do not need expensive equipment. A few simple habits are enough.

• Use a computer or laptop if you can. The test is on screen. Practising only on paper builds the skill but not the comfort with a mouse and keyboard. Get used to clicking accurately and quickly.
• Treat your eyes as part of the preparation. Take a 20-second break every 20 minutes of screen drills, and fix your seating and lighting.
• Sleep on a fixed schedule. These batteries test attention and memory. Both fall when you are tired. Keep the same sleep and wake times for the last two weeks.
• Limit phone scrolling before practice. A fresh, quiet mind makes the early minutes of a drill count.
• Move your body. A short walk or light exercise daily supports alertness. This is general good sense, not a promised score gain.
• Use official or reputable material. Be careful with paid packs that promise guaranteed clearance or "secret tricks". Aptitude tests are built to resist tricks, and nobody can promise a T-score.
• Practise under mild pressure. Ask a friend to time you, or set a visible countdown, so the real clock does not feel new.

Exam-Day Tips

• Reach early. Reach the centre by the reporting time on the e-call letter. Late entry is generally not allowed.
• Check your folder the night before. E-call letter, original photo ID as listed on the letter, the required medical papers in original, and the photograph if asked. Keep spare photocopies.
• Dress simply. Banned items include metallic wear, belts, wallets and watches. Check the letter. Fewer items means a faster security check.
• Choose your language before you start. The test is only in English and Hindi. Use the language in which you can read instructions fastest.
• Listen to the instructions fully. Each battery has its own rules and demo questions. Many lost marks come from a rule misunderstood in the first minute.
• Pace each battery separately. There is no total score you can recover later. A battery is judged on its own.
• Do not dwell on the previous battery. When one ends, it is over. Reset your mind for the next one.
• Stay calm if you feel slow. Most candidates feel the tests are fast. Keep an even rhythm.
• Eat light and drink water beforehand. Heavy food makes concentration harder.

Medical and Vision Standards: The Basics

The CBAT is not a medical test, but the ALP post has a medical standard, and the notices tie the two together through the CBAT-day paperwork. This section follows the official detailed notices.

• Medical standard: A-1, general fitness "physically fit in all respects".
• Distant vision: 6/6 in both eyes without glasses, tested with a fogging test. The notice says +2D must not be accepted.
• Near vision: Sn 0.6 in both eyes without glasses.
• Other tests: colour vision, binocular vision, field of vision, night vision and mesopic vision, among others.
• Refractive surgery: candidates who have had LASIK or any surgery to correct refractive error are not eligible for ALP.
• Final medical: this is done only after document verification, by Railway medical authorities. The standards in the notice are called indicative, and the notice refers to Chapter 5 of the Indian Railway Medical Manual, Volume I, for detail. Ex-servicemen have different standards under the manual.
• Failure: if you fail the final medical, the notice says you will not be considered for the post and no alternate appointment is given. A one-time medical appeal on payment of charges may be offered, with conditions.

The CEN 01/2026 self-screening declaration also lists points such as no speech impediment, no hearing impairment, no diabetes or hypertension, no cardiovascular or chronic illness, no sedative medication, no psychoactive substance use, no alcohol habit affecting alertness, no seizure or neurological disorder, and meeting the prescribed height, chest and weight standards. Read your own notice for the exact wording.

Conflicts to Be Aware Of

• A-1 versus A-2. One coaching page says CEN 01/2026 needs vision standard A2. The official notices for both cycles say A-1. Follow the official notice.
• Vision Certificate versus Self Screening Report. CEN 01/2025 asks for the Vision Certificate (Annexure VIA). CEN 01/2026 asks for the Self Screening Medical Declaration (Annexures VIII A and VIII B). Do not carry the wrong form for your cycle.
• Glasses. Some pages describe the vision rule loosely. The official standard is 6/6 without glasses, so people who need glasses should not expect to be accepted by hoping the CBAT is lenient. Check with an eye specialist early.
• Dates. Third-party pages report a CBAT date of 30 October 2026 for CEN 01/2025, while one source calls it tentative. Rely only on your e-call letter.

Common Mistakes to Avoid

• Ignoring the 42 rule. Doing well in four batteries and neglecting the fifth is the fastest way to fail.
• Believing it cannot be practised. You cannot change your basic aptitude, but you can learn the task, build speed and reduce silly errors. That is the part you control.
• Waiting for the call letter to start. The notice period can be short. Start once CBT-2 is done.
• Relying on tricks and guarantees. Anyone promising a fixed T-score is guessing.
• Mixing up the two notifications. Weightage and documents differ between CEN 01/2025 and 01/2026.
• Leaving medical papers late. You may be refused entry without the correct original document.
• Practising only for speed. Fast and wrong does not help in tests that count accuracy.
• Ignoring eye health. A vision problem found at the end can cancel months of effort. Get checked early.
• Drilling the night before. Rest improves attention. Last-minute cramming does not.
• Going silent on the mock side. Dropping CBT-2 revision before your results are final.

FAQs

Is the CBAT compulsory for RRB ALP? Yes. It is a stage in the recruitment process, after CBT-2 and before document verification. Candidates shortlisted from CBT-2 Part-A, and who qualified Part-B, take it.

How many candidates are called for CBAT? The notices say 8 times the number of ALP vacancies for each notified category, RRB-wise, on the basis of Part-A marks of CBT-2. Ties at the cut-off are all called.

What is the qualifying score? A minimum T-score of 42 in each test battery separately. This applies to all categories with no relaxation.

Can I make up a low battery with a high one? No. The notice says each battery must be cleared separately.

Is there negative marking in CBAT? No. The notice states there is no negative marking. Even so, careless answers can still hurt your accuracy, so do not click randomly.

How much does CBAT count in final merit? Under CEN 01/2025, 30%, with 70% for CBT-2 Part-A. Under CEN 01/2026, 50:50. CBT-1 marks do not count in the final panel under either notice.

Which batteries are in the CBAT? The official notice does not name them. Commonly reported are Memory, Following Directions, Depth Perception, Concentration and Perceptual Speed. Some pages add a mechanical comprehension battery, which I could not confirm. Check your e-call letter and the RDSO page.

Can I wear glasses and still be selected? The standard in the notice is 6/6 in both eyes without glasses, with the other vision tests passed. Candidates who have had LASIK or similar surgery are not eligible. Confirm your own case with an eye specialist and the latest notification.

What happens if I fail one battery? You do not qualify the CBAT, and the merit list is made only from candidates who qualify, so you would not be in it.

In which language is the CBAT? Only English and Hindi, according to the notices.

Final Word

The CBAT rewards candidates who know the tasks, stay calm and keep a steady rhythm. Keep your written-exam edge sharp too, because CBT-2 Part-A is still the larger or equal part of your merit. Practise CBT-2 style questions with full-length mocks and sectional tests on Pareeksha, and use the weeks before the aptitude test for the plan above. Always confirm dates, documents and weightage from the latest notification for your own CEN.