I would recommend getting a copy of the Trainer for LR. It will have close the gaps. Also, with your score I would suggest drilling more practice problems on specific question types.
And, if you did PT50 (Sept 2006), you haven't even gotten to the Comparative Passages era of LR. Another major shift; IMO, one for the better (I have the least problems on Comparative Passages, but others have different experiences).
Hey @nicole.hopkins, quick question: you mentioned you flipped through your tests and marked questions for each drill set, but where did you get a categorization of the all the problems from prep tests 1-34ish?
Yeah I didn't like using the app for discussions since the notifications would never show up, but then they fixed that a few weeks ago so I've started using that and am now running into the problems you describe. Perhaps I'll switch to Safari.