What are the most important topics I should focus on now, as only 3 months are left

@ AMIT 
u knows abt your strongest and weakest topics better than me.. so, just try to focus upon your weak topic to get maximum advantages. try to recall out every formula and solve previous year jee paper, as far as possible.
solve mock test paper to check your understanding on subject and also try to solve a given ques on limited time period. 
HOPE IT HELPS