Well as far as I can remember, it was a gauge of your strengths (or weakness), and they are pretty much test questions which are similar to the review Qs, also with rationale. At the time I was reviewing, I hadn't really started anything yet but only took notes on my pad so that I could review it at a later date. So if I understand correctly, you may have probably encountered these test Qs from your past review/ readings. However, I believe it was a huge help and would do it again.