Do these Three things and you are bound to get 95% or above-
1) read NCERT line by line very seriously
2) see each question (excercise + intext+ solved) of NCERT, may take help of Arihant solutions to ncert if you haven't prepared yourself.
3) Buy CBSE previous 8 years question bank by ARIHANT(or any other) for each subject in january, solve each question of it.
Before two days of exam see ncert and previous years' papers quickly.
