The Cambridge reading lists are for first years I believe. I'm astonished (and a bit skeptical) that you've managed to get through those before you've even done maths A level. Save it, doesn't matter just get the UMS in maths and your other subjects. Next year, continue to not bother with it, focus on STEP and grades. I'm getting a reading list soon and I won't be touching it until after exams as meeting the offer is far more important than getting the degree done a year early!