I agree with Weeping Cassandra re private school but just to add we don't really have anything similar to the SATs here. I think you have that in addition to your GPA made up of your normal subjects, is that right? Most of our uni courses don't require an additional test, other than your GCSE/A level grades, with the exception of law (LNAT) medicine (various - UKCAT, GAMSAT, think there's others) and then Oxford and Cambridge tend to do their own admissions test for each subject, but those are specific to Oxbridge and wouldn't be a score that you'd submit to any other uni. Not sure about medicine or the Oxbridge admissions tests but I did the LNAT as I read law, and you couldn't repeat the test to get a better score - you could only sit it once per application cycle. It was possible to buy a 'prep course' if you were rich, but we were actively discouraged from doing this anyway as it was thought to be a bit of a con, and the skills tested on the LNAT weren't really things you could cheat your way into being good at. Also, not all unis even care about the LNAT, only a few of them actually require it. So, the money thing definitely would've helped Ruby for private school fees (although some private schools are selective and some aren't, so it would also be worth knowing which kind she attended) but not for any external test type thing, and as Weeping Cassandra said you can't really endlessly repeat your A levels or GCSEs in the same way