I won't comment directly on whether our books are useful (obviously, I think they are, and just as obviously, I have a major conflict of interest with that opinion!), but I just want to mention: we're about 2 weeks before your test date and you're thinking of ordering a bunch of new books right now. You may need more time. I generally don't like to tell people to postpone because I think most people just get nervous or use the ability to postpone as an excuse to procrastinate (I know I would totally procrastinate if I didn't actually like taking these tests!). But, in this case, a postponement could be warranted.

Just something to think about. As long as you do it more than one week in advance, you get to apply most of the fee you've already paid to the next test date. If you do it within 7 days, I think you lose the entire fee and have to pay again.