Hello

To get 80 marks in Jee mains.,

Firstly make a time table to prepare for subjects according to your convenience and now according to the time table, start preparing for the exam by managing your time. And moreover your timetable should be in a such a way that select the easier topics in every subject you feel and complete those first within short period of time and next the harder the topic you feel increase the time of preparing and solve previous papers to know how the questions is going to given in the paper and also what type of questions and also for more which topics can been known.

Hope this helps you....