Hellooo
and thank you very much! I'm sure St Andrews is perfectly realistic for you and you're just being modest hehe
Hmm interesting, for Maths direct 2nd year entry, they specified that you need A*AA with A*A in Maths and Further Maths respectively, when the standard offer for Maths normal entry is A*AA, so they were quite specific on the website. May I ask what subjects you're doing for A Level (or whatever qualification you're doing)?
The statement they made seems quite vague so I'm not sure what it means, but in terms of predicted grades, it would be hugely beneficial for your predicted grades to be higher than the standard offer. St Andrews is a tiny university, so is heavily oversubscribed, especially for Computer Science (one of the UG courses St Andrews is most known for if I'm not mistaken), and I know very few people who got offers with predicted grades the same as the standard offer for Maths this year (since you're looking at a cohort of applicants who have similarly achieved high GCSE grades, and have written a great (or decent at least) personal statement, so predicted grades also play a huge part in deciding who to give offers to, as of course a person who ticks all 3 boxes is more likely to receive an offer than someone who ticks 1 or 2).
I'm not an expert on this so it might be worthwhile to email admissions, asking what they mean by 'excellent Advanced Higher, A Level or International Baccalaureate qualifications' in terms of applying for Computer Science. Hope the stuff I said was helpful though