Hello aspirant,

You can prepare for JEE mains by end of october by just reading for about 6 hours daily and giving around 2 hours to each subjects, please note that you don't study a single subject for more than 1, 1.5 hours straight as if you keep studying one subject throughout the 6 hours you will be bored and lose interest, please try to change subjects after each hour or hour and a half, have proper diet while you study and have some fun too. You have a lot of time to study and can easily finish the whole syllabus by end of October .

Please visit the below mention site to know the syllabus.

https://engineering.careers360.com/articles/jee-main-syllabus

Once you have syllabus, try figuring out which subjects and topics you are strong with and finish them as soon as possible. than take the difficult topics or areas you have problem with.

I hope it helps.