hey dont worry it is one of the most common problems which student face in physics
see first of read NCERT try to attempt the solved examples without seeing and following the same approach solve the exercise. dont worry if u could not do some or even all the qes.
now ask urself where r u getting stuck!!!!!!
now READ MTG INTERACTIVE PHYSICS(( 8 PARTS ) it will booost ur concept to sky high and u will feel confident u will also get to know how to apply concepts in ques through this book..
now attept alll the ques of H.C. VERMA and unattempted ques of NCERT
by following this u can definitely make physics as your strong point.....
U SHOULD MAINLY CONCENTRATE ON MECHANICS AND ELECTRODYNAMICS (ELECTROSTAT current elec. magnetic feild EMI ac) and a little attention to THERMODYNAMICS(it is quite easy) ALSO