i wud say read these ( as much as possible ):

1. Study thoroughly the books of Physics, Chemistry and Maths of Classes  XI & XII.

2. Refer to the following books (XI & XII syllabus) to increase the level of competence :

For Physics :    

Concepts of Physics by H.C. Verma Vol/ I & II

For Chemistry :

Physical Chemistry By R.K. Gupta,

Organic Chemistry By Morrison & Boyd,                                                                        

Organic Chemistry By I. L. Finar,

Inorganic Chemistry By J.D. Lee ,                                                  

Objective Chemistry By Dr. P. Bahadur

For Maths :

Higher Algebra By Hall & Knight;

Co-ordinate Geometry By S.L. Loney;

Plane Trigonometry BY  S.L. Loney,

Differential Calculus By G.N. Berman ;

Integral Calculus By Shanti Narayan ;                           

Vector   Algebra By Shanti Narayan ;

MCQ By A Das Gupta

i hope this helps u in such timeof distress.

in addition u can download the link given below for ResoNET sample paper ( Resonance Entrance Test ):

http://www.resonance.ac.in/Files/SampleTestPapers.pdf

Do rate me if this was of any help