CUET

For admission in Institute of Engineering and Technology (IET) Lucknow for B.Tech in Computer Science or Artificial Intelligence, you must fulfill the requirements of the chosen path in your 10+2 (or equivalent). ). According to the eligibility criteria, physics and mathematics can be looked at as compulsory subjects, and so must one of the following subjects: chemistry, biotechnology, engineering.
So, in addition to physics and mathematics, you can opt for one of the following subjects.
Chemistry
Biotechnology

No CUET is not compulsory to take addmission in all colleges, although many colleges have made it compulsory but not all the colleges so what you need to do is, you must visit the official website of the college you want to take addmission in and look for the eligibility criteria, secondly I would like to suggest that it will be better to Qualify CUET as it will open losts of opportunities for you.

Yes, you can still take psychology for the CUET exam even if you didn't take it in class 12th. The CUET allows students to choose subjects that were not necessarily part of their class 12 syllabus. As long as you meet the general eligibility criteria, such as having passed your class 12 or equivalent examination with the required percentage, you can opt for psychology as one of your subjects in the CUET exam.

For undergraduate programs, the CUET exam fee is INR 600 for one and INR 800 for two or more programs. For PG the fee is INR 1000 for one programme and INR 1200 for two or more programs.

While the ICAR PG exam fee is INR 1200 for general candidates. And ICAR UG exam fee is INR 1000 for general candidates.