To bump this and post my own experience- My scores seem to be hovering in a rather narrow range, often for different reasons. Excepting one sub-175 outlier (173) on a particularly bad day, I've scored the following on Preptests 33-37:
179, 177, 178, 177 in terms of raw correct (circled) answers on the test sheet, and 179, 177, 177, 175 actual score when including misbubbling, which occurred on the last two tests. I'm doing fine with timing, I typically finish around five minutes early, sometimes closer to 10 for LR.. I'm restricting myself to one preptest a week at the moment to prevent burnout, which happened to me previously. I've never hit a 180 on a test (yet). My incorrect answers seem to be fairly consistent: -2 LR, with -0 to -2 on either LG or RC, varying with each test. It seems as though I can obviously stand to improve LR accuracy a bit.. the LR questions I miss seem to include roughly one careless or seemingly preventable mistake, and one where I simply miss the problem due to incorrect understanding.
I'm thinking perhaps I could use a primer in informal logic, so I've ordered Douglas Walton's book on the topic recommended by a prior 180 scorer; however others have mentioned limited success with this book.
Any ideas for a better informal logic book?
Just from re-reading what I've written above, it seems like aside from minimizing careless errors, I could stand to improve games accuracy to -0 all the time, which many here seem to do, along with focusing on improving LR performance.
Over the last two weeks, on preptest 36, I made two fairly careless LR mistakes + a misbubble that kept me from a 180, and on 37, I misread a rule in LG and misbubbled an LR q that kept me from a 179.. to some extent I think the more I practice the more of these mistakes I tend to make, for whatever reason.