For Comp sci should I go Exeter, Leeds ,RHUL , Surrey or take a gap year and reapply

I'd say accept one of your offers for now, focus on your A levels then decide on results day if you want to reapply (no point deciding now in case you don't even get the grades you need).
Also keep in mind warwick, kcl, and bristol are all mega competitive for CS afaik so getting A*AA won't guarantee you an offer (I'm sure you've heard stories of people with 4 A*s being rejected). That doesn't mean you shouldn't try at all, but you should think about why you actually want to go to these unis and assess whether its worth the risk/waiting an extra year.

well ofc and warwick and bristol I have contextual so im more likely to get in , im just looking at the hypotheticals cuz going to one of them would be way better for computer science then my current offers and the job market is already crazy so id want to boost my chances as much as i can.

I don't think contextual increases your chance of an offer, just gives you reduced entry requirements (which will be irrelevant for you if you have achieved grades). I could be wrong tho? I mean if you really want to go somewhere better than a gap year would be worth it probably.

yeah but if im contextual for bristol which is AAB and i get A*AA ? would i not be seen higher

My predicteds wasnt the best but I was thinking of doing well in my Alevels A*AA maybe and reapply to Warwick cuz i have contextual , Bristol also contextual , KCL ,Nottingham and one safety . I am from London if that changes anything