Hi Buster,
I've completed Mod 1 with BGS, and am now on Mod 2. (Only 2 months left...Hurrah!!)
The progress tests should be done from memory, not from looking through your notes, unless you really don't know something. (I'm not sure if your open-book comment means you are using notes to answer each question. If you are, I would say stop it, and try to pass the tests without reference).
I tend to do each frame, and aim to get 75% on my first attempt. Most of the time I get this, but a few have fallen short. If this happens, I go back over the notes again, and try once more. If you are getting below 50% all the time, then you clearly need to do a more in-depth look at the notes.
The nearer the brush up comes, the worse you may feel. I couldn't recall the vast amount of data for the earlier frames, although I did make sure I understood stuff. There is a big difference between memorising data and knowing it. Make sure the concepts of Gen Nav, Met, Instruments are familiar.
As Matt mentions, it is a hellish couple of weeks, but you will be prepared for the exams.
