Hello. ICAR is all about focusing on your accuracy and speed because number of question is high but level of questions is moderate or low in general.

If you are from maths background then the chances are easy as compared to BIO stream.

The point is NCERT of concern subject is the best source with lot of practice with any coaching classes test paper. Get thorough with it.

Give mocks and tests to gain confidence on your test and preparation level. the questions are mostly objective type.

Prepare smartly.

All the best.