Dear patil
Fitst I will suggest you to join any coaching classes.Because as you are preapearing for IIT JEE then you will face a tough comptition.

coaching classes can guide in a better way.
You don’t need to worry about that now as can start online coaching where you can have a flexible timing ..So i wud advise you to join Askiitians.com.

click here for more details about the packages in Askiitians .com :

 www.askiitians.com/packages.aspx
for 11th standard most effective and possible way is

besides school and coaching hour you should give 3-4 hour in your home for IIT JEE Prepration.

and for the rest of your board subject except(P C M) you can give 1 hour per day and 3-4 day in week.
Just stay calm and focus on understanding rather than mugging. Be regular in class and stay with concepts.




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Regards,
Askiitians Experts
Badiuddin