Hey, I used TPR for all my practice and I was fine for the sciences. The verbal, however, helped a little, but was different enough to throw me off on the real thing. I retook and did the 4 real aamc mcat practices the last week and a half to get use to real mcat verbal. I think it helped a lot.
I dont think it matters too much if you use any of those 4 companies for the sciences. Verbal will be hard to find good practice.
Here's a tip: Try to work up to doing ~30 questions (4 passages) in 30 minutes with the same accuracy as if you had 40 minutes. Then, the last few weeks slow it down to doing full practice in the correct time.
I did this on accident when preparing for the 2nd time. When I slowed down, my "silly mistakes" were for the most part corrected and I could complete the entire section. My score increased 4 points in verbal.
Good luck, just keep pushing!! Two more months of hard work will be worth it in the long run.