Dude dont worry at all. Ur time of starting the studies is almost perfect. i say this as by now u will be familiar with topics like vectors and units and dimensions etc. and u wont struggle like the ppl starting in june or july. U will have to however study and try to finish ur course by november 2008 end to give ur self time for revison.Dont worry u havelot of time. The rest of Sathyaram sir's advice is too good!.Follow it u 'll get an excellent rank in iit.

However what happens is that u will probably read this message and get charged up, but the momentum fissles out in 2/3 days. So have a copy of sathyram sirs advice and read everyday. U will feel more foccussed towards your goal

Cheers