how tp prepare for iit so dat i can get top rank

1st u shold join good coaching classes like bansal,allan, fiitje,cp. then u shold do more and more problems solve as many questions as u can and study 5to8 hours a day

you should go through many good books or join some good coaching like allen, resonance or akash you can join their classroom course or distance learning courses.

better google it,you will find better results then asking here