if you're aiming for IIT, then i would suggest u get a good integral calculus book like arihant, ml khanna, etc.. but school text book ain't bad if u just wanna learn the basics..
JEE and OLYMPIA INFINATUM
http://iit-redefined.theforum.name/index.php
go for 1. ncert first as it will clear ur basics 2.good subjective medium standard book to sharp brain and then objective book to increase speed.......
adversities cause some men to break other to break records............i m of the other type....... :-)