Can I ask you two, are you doing all of the reading, all of the homework and re-reading things you aren't 100% clear on? I.e. if you couldn't explain in detail how transcription works or how the kidneys work, you go back and study until you can.
I'm taking TPR right now and I feel like if you only do the bare minimum in the class, it won't be sufficient unless you learned ALL of the material really well in school the first time. It seems like for most, there are parts you know well and parts you are practically learning for the first time (all of physio for me).
Also, painful as it is, I think following all of the verbal instructions at first is important.
Maybe its just me, or my teachers but I've been really happy with TPR so far -- at the same time I'm studying ~20 hours/week outside of class.
Also keep in mind the first two diags are supposed to be killers -- not indicative of a real score (so I hear on this forum).
Good luck