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A strong JEE Main rank is not the only condition for an NIT, IIIT or IIT seat: your Class 12 marks must also clear a separate rule. The rule is short, but the details, especially which five subjects count, decide borderline cases. This post explains what the 2026 rules say, works through two examples and lists what to check before you count on a seat.
What does the rule say?
The JoSAA 2026 business rules, dated June 01, 2026, set the Class 12 condition in two annexures, one for IITs and IISc and one for the NIT+ System (NITs, IIEST, IIITs and other government-funded technical institutes). For the NIT+ System, a candidate must satisfy at least one of two criteria:
Pass Class 12 with at least five subjects and at least 75% aggregate marks, or 65% for SC, ST and PwD candidates.
Pass Class 12 with at least five subjects and be within the category-wise top 20 percentile of successful candidates of their own board.
For the NIT+ System, the candidate must have appeared in Class 12 for the first time in 2024, 2025 or 2026. The CSAB Special Rounds 2026 brochure repeats the same criteria for NIT+ seats in its Annexure 2. The IIT annexure has the same two criteria, with Physics, Chemistry and Mathematics compulsory.
Which five subjects count?
For B.E./B.Tech. at the NIT+ System, the rules count:
Physics
any one of Chemistry, Biology, Biotechnology or a Technical Vocational subject
Mathematics
a language (the higher-scoring one if you took more than one)
any other subject, the one with the highest marks
For IITs the second subject is Chemistry. If a subject is not marked out of 100, marks are scaled to 100 so the total is out of 500. If a board gives only letter grades, you need a certificate from the board giving equivalent marks. If a board gives marks across Class 11 and 12 together, only Class 12 marks count.
Worked example 1: passing on aggregate
An ISC student, general category, has Physics 78, Chemistry 70, Mathematics 85, English 72 and Computer Science 90.
Five subjects: 78 + 70 + 85 + 72 + 90 = 395 out of 500.
Aggregate = 395 / 500 × 100 = 79%.
79% is above 75%, so the Class 12 condition is met.
Worked example 2: just short, then the percentile route
A CBSE student, general category, has Physics 70, Chemistry 62, Mathematics 74, English 80 and Physical Education 85.
Total = 70 + 62 + 74 + 80 + 85 = 371 out of 500.
Aggregate = 371 / 500 × 100 = 74.2%, below 75%.
The student can still qualify through the second criterion if 371 is at or above the general-category top 20 percentile cut-off of their board for that year.
The cut-off is calculated by the board from its own successful candidates that year. If a board does not publish it, the rules ask for a certificate from the board in a set format; without it, CBSE cut-offs for the relevant category are used.
What about improvement exams?
The rules treat the two routes differently. To meet 75%, you may reappear in one or more subjects, and the better mark in each subject from your two attempts is used. To use the top 20 percentile route, you must reappear in all subjects, because the percentile is calculated on a single academic year. Marksheets must come from one board.
What should students and parents check?
Read the current year's JoSAA business rules and CSAB brochure on the official sites. The years of eligibility, subjects and cut-off rules are restated each year.
Work out your five-subject aggregate under the rules, not from the marksheet total.
If you are near 75%, find your board's top 20 percentile cut-off for your category as soon as it is released.
Plan Class 12 study time knowing that board marks matter even with a strong JEE score. Our JoSAA counselling basics for parents explains the rounds, and CSAB special rounds covers what happens after JoSAA.
Common mistakes and how to avoid them
Assuming a high JEE Main rank overrides board marks. It does not for these seats.
Using all six subjects, or your five highest marks in any combination. The rules fix which slots count.
Forgetting the category relaxation, 65% for SC, ST and PwD candidates.
Reappearing in only some subjects and expecting the percentile route to apply.
If balancing board preparation with JEE feels like two plans pulling against each other, Fermi's AI tutor can work out what you already know and build a plan for the session, so you sit down to a clear next step.
Today, write your five subjects in the order the rules use and calculate your aggregate out of 500.
