There will be a lot of time for you to study for 11th and 12th maths. I would advise you to first be perfect in your tenth mathematics and score a good percentage in tenth. Then you can concentrate on your 11th maths. If you are sure that you have your tenth maths at your finger tips, then you can look at 11th maths but it is not at all necessasry as from my experience.
Please feel free to post as many doubts on our discussion forum as you can. If you find any question
Difficult to understand - post it here and we will get you the answer and detailed solution very quickly. We
are all IITians and here to help you in your IIT JEE preparation.
All the best Chirag !!!