In order to carck IIT-JEE exam it is very important that your base should be srong. Your concepts should be clear. NCERT book is recommended to clear your concepts.Apart, from NCERT you should focus on below booksPhysicsConcepts of Physics Vol I and II by H.C. VermaFundamentals of Physics by Halliday, Resnick & WalkerProblems in General Physics by I.E. IrodovMathematicsMaths XI & XII by R.D. SharmaPlane Trigonometry Part 1 by S.L. LoneyPlane Co-ordinate Geometry by S.L. LoneyHigher Algebra by Hall and KnightProblems in Calculus of One Variable by I.A. MaronChemistryPhysical Chemistry by O.P. TandonOrganic Chemistry by Paula Bruice YurkanisOrganic Chemistry by O.P. Tandon You should also refer previous year papers and complete mock test series for your practice. All the best!!