if it’s any help, i don’t believe the edinburgh maths degree makes you do mechanics. it’s my favourite area of maths and i asked a student when i was still intending on doing a maths degree and their course had no mechanics in it. the entry requirements are A*AA. however, if you don’t have further maths you’d likely struggle on a maths degree for the first year, so i agree with others that economics may be more suited.