This surely depends on the university and the course. At mine (admittedly for a maths degree) the start of the course involved quickly running through the conte

This surely depends on the university and the course. At mine (admittedly for a maths degree) the start of the course involved quickly running through the contents of the A-level FP3 maths module (which the degree did not technically require) in about two lectures as well as jumping straight into topics that weren’t very relevant to school maths (group theory and a first “set theory/welcome to proofs” course which both quickly became hard). Students doing physics seemed to get reasonable physics maths (e.g. vector calculus things like surface integrals and Green’s theorem) without spending lots of time revising school maths. I don’t know what the computer scientists got but I got the impression that the university preferred applicants who were good at maths to those who were good at programming. Though maybe they needed help with asymptotics: U.K. school maths doesn’t cover limits and it is hard to define big O if you don’t know the definition of a limit.