i passed my 10 4m p.s.b.e. but now i'm in +2 hav sci and get 83% 4m 10th i also want to get best %in +2 as well as in IIT also so you may me

hello sir/mam I'm aman sachdeva i done my matrix 4m p.s.e.b.and get 83% i hv fear with only that much marks may i eligible for IIT after +2 (c.b.s.e) completed in next year(2012) so anybody may help me to give the proper advise abt IIT and how the forms r to be arranged and how 2 get rank in IIT...