I used this book and I think it does a very decent job in preparing myself in science sections. I didn't have time to finish all the questions there but I definitely recommend you to do all the free standing questions and half of the passages. There are some difficult ones they marked. If you are not shooting for 13+ don't bother. Get the solid foundation first. Make sure you take notes on every question you GUESSED and got WRONG, this is a very important process of learning. Forget about the question style in your real test, focus on how much you really know. If you have a good knowledge foundation, you can handle any question style