Cat 2

I know a lot of you must be fed up with this question but my cat 1 paper were pretty good like 6-7 marks above average, in some even 10 -15. My quizes till now are also okay but I am not prepared for cat2. Even though I have notes it's just I am not confident. How much is cat 2 gonna affect my GPA if I score around class average? Vellore| first year