Hello Nikhil ,thanks for asking this question on this platform.the greatest pain in life is the feeling of regret so please be mentally strong first it is never too late to start anything .and as you want to prepare for JEE firstly get the syllabus of JEE and go through it then Anne a proper schedule for covering all the topics then also solve the previous year question papers.thanks 

Hello Nikhil,
The main thing is that you have to build your concentration level, then only you can follow a proper time table, if not, then any one can't stay focused on any timetable. If your concentration is high then you can complete most of the syllabus in school and coaching because you are studying same thing in school & coaching. So, between 2:30pm to 7:00pm you may study for three hours, it is enough for that. I would like to say that please limit the study time between 10 to 14 hours and please increase your concentration and speed of reading, understanding and solving the problems then you will not face any kind of difficulty.
Don't take stress first of all you have to stay focused on your 12th board exam because you should have secure at least 75% marks in the 12th class board exam, or be in top 20 percentile in the 12th class exam conducted by the respective Boards. Then only you can eligible to appear in the jee advanced exam.
For preparation of exam, the most important thing is your confidence after that we talk about syllabus. You should know the whole syllabus of jee main exam. Your basics in Physics, Chemistry & Mathematics should be very clear upto 12th std. You should read the NCERT books for basics. Then HC Verma for Physics, RD Sharma for Mathematics, OP Tendon for Physical & Inorganic Chemistry, and Organic Chemistry of "Arihant Publication" for detail or extra knowledge. 
You should also try to solve the previous years question papers, this helps too much and you should also give the mock test to rectify yourself and build your confidence level.
Thank You

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