NCERT textbooks of 11th and 12th standards of Physics, Chemistry and Mathematics are to be referred. 

Other books for entrance exam is as follows :-

For Physics :- Concepts of Physics by H. C Verma Volume 1 and Volume 2,  Fundamental of Physics by Halliday, Resnick and Walker, Objective questions on physics by D.C Pandey.

For Mathematics :- Higher Algebra by Hall and Knight , Co-ordinate geometry by S.L Loney, Trigonometry by S.L Loney,  Mathematics 11th and 12th by R.D Sharma, Problems in Calculus of One Variable by I.A Maron.

For Chemistry :- Chemistry is divided as inorganic, organic and physical chemistry. 

For Inorganic Chemistry :-Inorganic chemistry by O.P Tandon, Concise inorganic chemistry by J.D Lee 

For Organic Chemistry :- Organic chemistry by Morrison, Organic Chemistry by T.W Graham Solomons, Organic Chemistry by O.P Tandon

For Physical Chemistry :- Chemical Calculations by R.C Mukherjee, physical chemistry by O.P Tandon, Physical Chemistry by P.W Atkins

Prefer past year papers and also give mock tests. 

If you still have any queries feel free to ask in the comment section down below.