Which types of book would i refer for iit now i m in 11th class

first of all i would like to wish you all the best for your aim......................... secondly i would like to tell you that you should focus on self study rather than looking for several books................................ books provided by your coaching centre, your school book and study material provided by this site are more than sufficient..................... so rather than focusing on quantity of books, you should focus on quality study but if you still want to have a list of useful books then here they are:-

Physics:

1) NCERT

2) Concepts in Physics by H.C Verma (Two volumes)

3) Problems in General Physics by I.E. Irodov

4) University Physics by Freedman and Young or Fundamentals of Physics by Halliday, Resnick and Walker

5) Aptitude Test Problems in Physics by S.S. Krotov

Chemistry:

1) NCERT

2) Numerical Chemistry by P. Bahadur or Numerical Chemistry by R.C. Mukherjee

3) Concise Inroganic Chemistry by J.D. Lee

4) Chemistry Principles & Applications by Sienko and Plane

5) Organic Chemistry by Solomons and Frhyle or Organic Chemistry by Morrison and Boyd

Mathematics:

1) NCERT

2) Higher Algebra by Hall and Knight

3) Problems in Mathematics by V Govorov, P.Dybov, N.Miroshin, S.Smirnova (Edited by A.I. Prilepko)

4) Trigonometry by S.L Loney

5) Coordinate Geometry by S.L. Loney

6) A Course in Mathematics for IIT-JEE by Tata Mc-Graw Hill

hope it helps

 I would recommend UNIVERSITY physics by sears and zemansky, op tandon series for chemistry and kc.sinha for maths