Not fully related subjects but good IB score?

Wow! Congratulations on the results! Why would it be a disadvantage?

Might be overthinking it but I assume computer science applicants (especially at top universities like my list) usually have double science and math AA. Unfortunately I don't have those and instead have HL math AI and only 1 science. I also have 2 social science, including BM which is the easiest SS, overlapping with economics which I heard university don't like to be taken together

UK unis only require HL Maths for CS, they don't require or expect sciences beyond GCSE level.

In principle the overlap between business and economics can be an issue for A-level students as they only do three subjects normally, however I think it's less pronounced for IB students as they do a much broader programme. You're also doing 4 HL subjects anyway.

The major point which may be a potential issue is by the look of it you're doing HL Maths AI and not HL Maths AA - some unis may specifically require the latter (and the latter is probably more closely aligned with the needs of a CS degree anyway). So you'd need to check that against the unis you want to apply to.

Of the three listed as your "other" option, Bristol is by far and away much stronger for CS. Followed by Lancaster then distantly by Exeter (which I wouldn't really recommend - when I was at Exeter the programming options offered by the CS department were so poor that the engineering department didn't let the EEs take them and had them do the physics department programming modules).

In any event in terms of your predicted grades pretty much any UK uni is a consideration, the only thing you'd need to do is check if they will accept/consider HL Maths AI rather than HL Maths AA. That may rule out some of the stronger CS departments like Imperial/Oxbridge/Warwick, but do check to be sure.

Would also recommend looking at Edinburgh (any of their CS courses including the flagship informatics degree) as they are very strong too (stronger than some of your other choices - KCL is a bit more average compared to the others for example).

Hey thank you so much for your advice,
That's kinda why I ask the questions, I know that my lists all accept HL math AI but I just wanted to know if my subject lists will be a massive disadvantage for them? Would I still lose to those with the "correct" subject even if they have 38?
Thank you for the help for the fifth choice. I think I will remove Exeter. I realize bristol is a really good university (best out of 3 choice) but I am just a bit scared of the entry requirements, currently it's 38 18HL (7 in math), I am wondering whether to take a bit of risk by having bristol or should I have a "safety" school with Lancaster because their requirements is just 36 16HL (which they say will most likely got reduced if you have HL math or computer science) and thanksfully I have both.