I'm not sure if anyone is going to read this, but when you do past papers, simulate exam conditions as closely as possible, to get the most out of your study. That means putting on the 3 hour time limit, no talking, no looking at answers, until the time is up. Then get someone else to mark it(maths teacher is the best bet) and get them to tell you where you went wrong. My first maths assesment I did in Term 4 2003, I got 50% for. I couldn't work out why, after I had done so much study. Then I realised I hadn't done any past papers. The next assessment was in early February, so I worked through an ankle high pile of past papers, each time simulating exam conditions as closely as possible. I lifted my score each time, then when the assesment came I scored 93% raw and boosted my ranking into the top 10.