OBK,
Don't stress too much with it, it will come together.
I've now finished both modules with BGS, and each to their own style, but I personally used the prog tests first of all to try and test my knowledge to the best of my ability.
But after a while I kind of changed tack (possibly due to the fact I came across the same frustration as you) and used them in conjunction with the notes (ie. not necessarily trying to answer them all without looking at the notes) to identify gaps in my knowledge, then went back to the relevant section of notes and bloody well made sure I nailed that section.
Just an idea anyway, it worked for me (along with a fair amount of hard work), passed all first time, decent grades.
Good luck.
