Dear jayati,

First of all remove this fear from your mind. Just dont be scared.It good to hear that you are serious about JEE and if you can convert this seriousness into real efforts and outcomes definitely you will be in IIT like your brother.

You  have to get your basics very very clear.

Right now you can refer the following books and rest you will come to know when you go to Kota...

Maths: ML khanna, RD sharma , Arihant publications

Physics: HC verma, IS irodov

Chemistry: P bahadur, Soloman, JD LEE

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