Hey Bhimaray YH,

Start preparing for JEE mains by refering NCERT books for all the three Mathematics, Physics, chemistry. This is the most crucial time where you need to concentrate more to get a Good JEE rank. Firstly you need to note down all the main concept, formulas based on the given weightage as which concept has the most priority. Revise by your institute recommended book or by NCERT. Study for 3 hours from today so that you can score a good rank.