Hello maulik

You can prepare for your JEE mains from anywhere, you don't need to worry about the place, but you need to focus on your knowledge level and need to match the requirements to qualify for JEE mains, there are several coaching institutes as well as online platforms which not only helps you in preparing but also focuses on your overall development through calculating your learning speed and your growth speed.

You can check out Different materials provided by different institutes and then you can take several mock classes to check out which one is good for you.

There are coaching institutes like ACE,ALLEN,AKASH and online platforms like BYJU's and unacadamy.

It's better if you check out on your own as preparation depends on individual basis.

I hope it helps,

Best of luck