Erie, on 02 June 2010 - 01:14 PM, said:
What do you recommend I do to best prepare for it? What materials will I need for it?

Any advice appreciated.
I can't say for sure since I don't know you, how good you are at maths or how disciplined you are, and I'm not going to say it would be impossible. However I would say you should be at least achieving an 'A' for higher and be aware that you will have to put the hours in on your own. Advanced higher maths isn't something that can be learned for the first time the night before.
I'm assuming your school has said this is a possible option, if not speak to them as not all schools are keen on this.
If you are going ahead with it you'll need the 3 maths in action books which cover a unit each as well as past papers. I personally didn't find the scholar books of any help at all. My best resource (even better than textbooks) was my teachers whether asking them a question, using notes they had given in class or homework they gave out.
Pick whichever maths teacher you feel you would be most comfortable going to for help and ask them if they would be willing to talk through areas of the course with you during the year if you were to run into difficulty.