Very very urgent on cs exe. registration

Please Hlep me out...

Q 1. Am I eligible to appear both groups in dec. 2013 if i have paid registration fees on 28/02/2013.

Q 2. I do not get any message or Email for the ID and password, so i am unable to login and when i tried to resend it, its not working, what should I have to do for this?

Q 3. If I do any mistake in registering what can be done to resolve it?

PLEASE HELP ME, THANKS IN ADVANCE...