A T-score is a standardized score used in aptitude tests like CBAT (similar to what is used for RRB ALP and Psycho tests). It converts your raw marks into a standard scale so that everyone’s scores are comparable, even if the test versions (batteries) are different.
On this scale:
The mean (average) is set at 50
The standard deviation is set at 10
So, a T-score tells you how far above or below average your performance is compared to all test takers.
What are Test Batteries?
In CBAT, you don’t just get one paper. You face multiple test batteries — each battery measures a different type of aptitude needed for Section Controller (like memory, decision-making, concentration, reaction time, etc.).
For example:
Test Battery 1: Memory & Concentration
Test Battery 2: Decision-Making Ability
Test Battery 3: Spatial/Visual Aptitude
(Exact types are defined in the CBAT guidelines in the notification)
⚠️ The Rule: Minimum T-Score of 42
You must score at least 42 T-score points in each test battery, not just the overall average.
Even if you score very high in some batteries but fall below 42 in one, you will be disqualified.
This rule applies to all categories — no relaxation for SC/ST/OBC/PwBD.
Example:
Battery 1: T-score = 45 ✅ (Qualified)
Battery 2: T-score = 38 ❌ (Disqualified, since <42)
Battery 3: T-score = 50 ✅
Result: Candidate fails CBAT because one battery is below 42.
Why 42?
RRB sets 42 T-score as the cutoff because it roughly means a candidate is performing at least moderately above the lower end of performance. It ensures minimum aptitude for a safety-critical job like Section Controller, where alertness and decision-making are vital.
✅ In short:
T-score = standardized performance score.
Test battery = one aptitude test module.
Minimum T-score of 42 in each battery = you must clear all aptitude modules individually.
