Hello aspirant.

Hope you are doing great there. First of all I would recommend you to make your timetable by your own giving at least 5-6 hours of daily self study apart from the time you have spent at your coaching institute. Among the remaining time you should have a proper nap of at least 7 hours to avoid health issues . Another thing which I would suggest is if you have to choose among studying late night or early morning , then go with studying early at the morning . See for JEE mains every topic is important but still if you want to go with important topics , I would recommend you to to buy a previous year jee mains book which have chapter- wise questions in it , and there you can see which topic is giving you questions more frequently. Some of the important topic are mathematical reasoning , statistics , coordinate from mathematics ; electrostatics , optics , semiconductors from physics and periodic classification and inorganic chemistry from chemistry . You can make detailed estimate of important topics from the previous year book as mentioned above.

I hope my answer helps

All the very best!