Dear shivani
just by prepearing only 25 days ..Its very difficult to get in to IITs.
But if u have already prepeared for IIT JEE earlier. then you can revise in 25days. for this you have to work hard day and night.
if it is your first time prepration then its almost imposible to get through IITs in 25 day.
Please feel free to post as many doubts on our discussion forum as you can.
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All the best.
Regards,
Askiitians Experts
Badiuddin