Exam

You should have a valid MAT, CAT or IB-SAT score . If you don't have a valid score for the year. you will be denied for admission.

If u have category sc/st. then ur chances r high.
Fill the form of REAP. u may get govt. colleges.

hello
all colleges are good but it depends on various criteria on which a clge is ranked at 1 or 2 and so on. some colleges r good for btech some for mba etc. some are good for providing placement some are known for their faculties.
so it would b better if you specify the on which basis you want to kn

Use shiksha or other sites rank predictors. so that u may get idea about ur rank n branch.

if u have category sc/st then. taking drop is a bad idea. because u may get good colleges.
Bt if u have other category. or u have strong desire 2 do IIT. then go 4 it. otherwise not.

IimS.other mbas are good from govt run universities

yes you can get admission in private universities and institutions

take some gud branches.like cse .mechanical .I m not saying aerospace is a bad choice.but it will be beneficial if u go with iit. .unless leave it.gud luck bro. .but the final decision is in our hands.so think twice avot it