G. Polya (Score 1)

It depends on your learning style. If you are more self reliant: get a good text book. Many have been suggested already. Otherwise, get some interactive course with a teacher. In any case, I found the books of G. Polya very helpful. I strongly recommend his "How to Solve It" For example: http://www.amazon.com/How-Solve-Mathematical-Princeton-Science/dp/069111966X/ref=pd_bbs_sr_1/104-6874125-7411138?ie=UTF8&s=books&qid=1192445065&sr=8-1