No of attempts

obbiviously 2 attempts.

1 attempt = 1 exam schedule (even if you give one paper or one group or even dont attend the exam) attempt would be counted for all.

@ Ashish:

When you say that you had registered means you had regd for IPCC and not for a group. You must have applied the exam form for a group. And hence it will be considered that you had not appeared for an attempt. And attempt not appeared is also counted as an attempt. Hence it is considered as your second attempt. 

And yes whatever Anubhav said is right, you need to concentrate on your studies rather than thinking about the no of attempts.