Can someone guild me ?

So i want to apply to cs related fields in islamabad but I don't know much about air

I have 75 percent in O levels due to some reasons

I have better grades in A levels but they do not count since A2 result isn't out yet

Ans 84/100 in nts (which i can improve in nts if needed)

I'll also be giving the net if that counts for something?

How is the merit calculated for O/A level students and how much merit do i need to confirm admission