Dear madhur,
you dont need to be depressed and there is good time left for IITJEE preparation.What you have to do is study with full commitment and dedication and remove this panic from your mind.Go thru the good books available in the market and build your concepts..
We are all IITians and here to help you in your IIT JEE preparation.
All the best.
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Sagar Singh
B.Tech IIT Delhi