Hello student,

You have told that you will study only for four hours including the coaching, but sorry to say you it is apparently not possible to start from the basics and to get 1 lakh rank with wall with only 4 hours of studies including coaching.

You must should devote some more Times to your study schedule to get that much rank from basic studies. You must go through your NCERT textbook first specially for mathematics and chemistry part. Do mathematics from RD Sharma and physics from HC Verma to perform well. You also can go to the link below where you can find JEE main knockout course which will help you to perform well and study within a a right manner with lots of video lectures doubt solving personalized reports time table and all

https://learn.careers360.com/engineering/jee-main-preparation-material/