Don't forget, stick to the syllabus and you can't go wrong. A major thing to remember is to learn the concept of how things work, the exams last year were majorly based around knowing the concepts rather than just rewriting the text book, so work with the "Students Learn To" part of the syllabus. Really though, there is nothing really that hard to understand. As seremify007 said, it's a great subject to study and quite relaxing.
The only real challenge is staying off the net in class
Just an early tip.