CSAB (Central Seat Allocation Board) conducts counselling for seats in NITs, IIITs, and GFTIs that remain vacant after JoSAA counselling ends. If you did not get a seat you wanted in JoSAA, CSAB is your second chance and often has better availability because many top-rankers have already taken IIT seats.

What is CSAB? Who can participate?

CSAB fills seats in approximately 31 NITs, 25 IIITs, and 20+ GFTIs that are left after JoSAA closes. You can usually participate if you appeared in JEE Main 2025, hold a valid rank, meet the programme eligibility criteria, and complete CSAB registration within the official schedule.

  • You appeared in JEE Main 2025 and have a valid rank.
  • You did not get a JoSAA seat you want to keep, or you are planning your next best option.
  • You meet the eligibility criteria for the institute and branch you target.
  • You complete registration and any required fee payment on time.
Important
If you accepted a seat in JoSAA and plan to move into CSAB, check the official withdrawal and registration rules carefully before the deadline.

The CSAB round structure

CSAB generally runs 2 to 3 special rounds after JoSAA. Each round repeats the same core process.

  1. Registration and choice filling Register on the portal and rank your college-branch options in order of preference.
  2. Seat allotment CSAB checks your rank, category, quota, and choice order to see the highest preference you can get.
  3. Accept, float, or withdraw Depending on the round and the official rules, you may secure the seat, stay open to a better option, or exit.
  4. Institute reporting After the final round, you complete document verification and admission at the allotted institute.

How seat allotment actually works

CSAB follows a choice-based allotment model. The system checks your first preference before checking your second, then your third, and so on. That means your list should reflect what you truly want, not just what feels safest.

If you place a safe option at the top and a better option lower down, you can get locked into the safer option even if the better one was available.

Key tip
Put your dream options first, realistic options in the middle, and safety options later. The algorithm can move down your list, but it cannot move back up for you.

Why later rounds still matter

Round 2 and Round 3 can open better opportunities because some students withdraw, some fail to confirm their seats, and some vacancy patterns change after the first round.

  • Students may leave lower-preference seats after Round 1.
  • Unconfirmed seats return to the pool.
  • Certain branches and institutes become more accessible in later rounds.

Use real cutoff data before you lock your plan

Check your likely colleges using real CSAB cutoff trends before you build your final order.

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