Hi
Y12
Do Maths AS on new spec
It's very easy, don't get mistaken, some topics are just based on upper end (grade 7-9) gcse, and you do come up to new topics, however if you got that grade at GCSE you should be able to take it on with no issues. A2 is different to AS though, but for year 1 do not worry at all. A lot of people here grossly overexaggerate the difficulty of year 1.
But in the end, choose what suits you best, because ultimately that's what you'll get the best grade in, if you like maths, do maths, a lot of the reason why people here find it hard and don't like it at a level is because they didn't take it because they don't actually like the subject to begin with.