Nowen, pardon me for being sceptical, but are you saying you started doing past papers continuosly from January? (Jan-june)
Personally I am saying bye bye to Cambridge (even though I thought I could have applied there) after getting a B in further maths (and they basicly want 4 a levels!) so that sucks. I want to do economics so hopefully I get an offer at Oxford or LSE! Otherwise UCL
I did actually start around January, I learnt all of C1 in the summer holidays and C2 and S1 took me around 3 months to learn. I had enough past papers because not only did I do Edexcel papers but I also did AQA, OCR and MEI to further my understanding. On top of that there are also Solomon and IYGB papers to practice.