With an OBC-NCL rank of 20242 and a CRL rank of 66k in JEE Main 2025, you have a good chance of getting into a NIT for Biotechnology or Chemical Engineering. The specific NIT and branch you'll get will depend on the cutoff for those programs in your category. IIITs are also likely options, especially for branches like Information Technology.

Here's a more detailed breakdown:

NITs:

Biotechnology:

Many NITs offer B.Tech programs in Biotechnology. With your rank, you could potentially get into NITs like NIT Agartala, NIT Arunachal Pradesh, NIT Durgapur, or NIT Jamshedpur, but the specific branch and seat availability would depend on the cutoff that year.

Chemical Engineering:

NITs with Chemical Engineering programs, like NIT Karnataka, Surathkal, and NIT Trichy, could be possibilities. You'll likely need to consider the cutoff and branch availability in those NITs.

Other Branches:

If your first-choice branches (Biotechnology, Chemical Engineering) are unavailable at the NIT you're aiming for, you might consider alternative branches like Civil, Electrical, or Mechanical Engineering.

IIITs:

General IIITs:

With your rank, you're likely to be considered for most IIITs offering B.Tech programs in Computer Science, Information Technology, and other relevant fields.

Specific IIITs:

IIIT Allahabad, IIIT Gwalior, and IIIT Bhagalpur are examples of IIITs that could be within reach with your rank.

Branch Options:

IIITs often have a wider range of B.Tech programs than NITs, so you might find a good fit in branches like Electronics and Communication, or Information Technology.

Factors Affecting Admission:

Cutoff Ranks:

The actual cutoff ranks for NITs and IIITs vary from year to year, depending on the difficulty of the exam, the number of candidates, and the number of seats available.

Branch Preference:

Your branch preferences during the JoSAA counseling will significantly impact which NIT or IIIT you get.

State Quota:

If you're a state resident, you might have a better chance of getting into a state-affiliated NIT.

JoSAA Counseling:

The JoSAA counseling process is crucial for seat allotment. You'll need to carefully choose your preferences and participate in the rounds to get the best possible outcome.