hell ishan,

preference books that will be more than enough for a class 12th student to help you pass class 12th with good marks but will also help you prepare for the IIT-JEE competitions-

for maths-

refer to R.D. sharma

for physics-

refer to HC Verma , make sure you solve all the numericals too

for chemistry,

refer pradeep publications.

if you have opted for physical education

for physical education (as your optional subject)-

refer to the book adviced by your school, no such reference book is required

hope that helps

all the best