Dear kirti singh
so from now you need to work hard o get good rank in IIT JEE.
for 12th passed student most effective and possible way is
besides coaching hour you should give 7-8 hour in your home for IIT JEE Prepration.
You have 4 month left and this is sufficient for revision
I will suggest you to start from the begning. first revise your old notes in the same order as you was tought in coaching.
also refer good books of that topic. then solve standard question from books and IIT study material
and after finish the topic solve question of that topic from previous IIT JEE papers.
and also Join test series.so that you can compair your prepration level with others
you can join online test series it will save your time.
Just stay calm and focus on understanding rather than mugging. Be regular in class and stay with concepts.
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.