I applied to Cambridge, Imperial, St. Andrews, Warwick and Durham for maths. I am going to firm Cambridge, but I am by no means safe as I need 11 in STEP 2 and 3. I am undecided on my insurance choice, mostly torn between St.Andrews (AAA) and Imperial (A*A*A*). I don't trust league tables and I do maths further maths and chemistry, predicted 3A*s, what should I pick as my insurance? I think I would like to end up doing a PhD someday so yeah, what do I do?