Hey good luck guys
As some ppl have already said above, start working early on, from day one, just summarise the dotpoints you did at school every day in your book, trust me, the year goes very fast, and if you've been doing this you will breeze through the trials
I can tell you that if u do 3 or 4 unit maths then 60-70% of your time will be taking up with just maths - but you should enjoy doing it, well i do anyway lol
Make sure you sleep well, dont study 24 hrous a day, and dont go flat out early on - just an hour or two a day when you feel like it, get out the study book and do your summaries or write an essay, or do a maths paper, etc.
Another tip is if you find it hard to study, then study with a friend online. Use skype, or IRC or some other program, and try to get something going, it aids in motivation