Which IIT mains books have to prefer for good performance??

Hello,
With your question, I guess you are asking about JEE Mains and its preparation tips. Well, to be very precise, the first thing I would suggest for JEE Mains is to go through NCERT thoroughly because JEE Mains pattern is mostly based on NCERT concepts. For Physics, you can solve HC Verma both parts. For Chemistry, NCERT is sufficient. Just read NCERT line by line and understand its concepts. Inorganic Chemistry of JEE Mains is mostly asked from NCERT. For Organic Chemistry, just go through all the mechanisms and named reactions. Solve questions. For Physical Chemistry, you must be well aware of all the formulas used and solve a lot of numerical problems. For Maths, solve a lot of questions. You may prefer different books but I wouls ask you to stick to any particular book. Also, solve the previous year questions regularly.
For any further queries, ask me in the comments section.
All the best!