Thanks for the kind comments all.
I definitely recommend trying out some questions, it will help you immensely. If you scout around using the links I provided, and even doing a Google search on "exam 70-432 test questions" or "exam 70-450 test questions", you'll be able to pick up 30-40 questions for free.
There's also a trick to the questions. Most of the time you can immediately rule out two of the options (if you know your stuff), meaning there are only two options to choose from.