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
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