I would be very interested in a study group, and especially in taking properly timed preptests with a group of people to simulate real testing conditions.
eh a few in a row is decent, Id say starting at 3 +/-1 variation isn't bad, obviously becomes more and more the more tests in a row are in that range... tho test day is hard to fully simulate so there can easily be more variation on test day
Later later later! There is definitely a shift after PT65 and while it is subtle, you will be thrown a curve ball if you're not prepared by being exposed to the most modern tests.
If the Trainer schedule involves using individual questions from PT's 52-71, I would IMO avoid that. PT's 52-71should be the bulk of your full PTing as they are the "modern" LSAT as far as format goes.