Hi Pink Floyd,
If you look around this website, you'll find a lot of resources. I bought the book, "Cracking the GRE Math Subject Test" published by the Princeton Review. If you do Google searches for "GR9367", "GR8767", "GR0568", and "GR9768", you should be able to find PDF files for previous exams. On top of that, I've been cross-referencing everything with my stash of math books from college and high school, and I've been checking the internet for formulas and information just in case.