To safely score in the 11-12 range on later AAMC PS sections of practice tests I would say a firm 10 in every section and a decent ability to connect different concepts together is needed. TBR gives a lot of calculation problems in their PS sections in comparison to the practice tests of the MCAT, even AAMC 11 that everyone says is 'calculation heavy' If you're doing well in TBR PS timed, then you're in good shape.
Honestly I was scoring about 10-13 in TBR chem once i got used to the massive amts of calculations, I was doing about 8-10 in physics comparably. When I did the MCAT practices I was scoring about an 11 on AAMC 8-11, I think I got one 12 on AAMC 9. Basically all my mistakes were physics related, I only missed like 2-3 gchems and the rest were physics.
For BS, I was hitting about 12-13+ on every organic section, ochem can be tough section if you arent good with it, but TBR and the MCAT really keep it pretty simple in comparison to what you can be asked in an ochem class, which I just finished about 2 months before i took my MCAT. For bio I was getting anywhere from 10-12 in TBR. On AAMC practices I got either 12 or 13.
I only took the last four AAMCs because I heard they were the most representative, and I only had 2 weeks to take them and didnt want to burn myself out with practice tests after I had done a lot of passage practice with TBR the 3 weeks before. I'm still waiting on my MCAT score, honestly that could be anywhere higher than 30+, i dont think I got lower but you never really know with this test.
Bottom line, TBR is more difficult. It is more calculations and concept heavy. If you master TBR, the real MCAT will not pose a problem most of the time, barring those tough sections that seem to pop up with one or more experimental passages and big preset curve. One thing I dont think TBR prepares you well for is the BS section throwing bio questions that require a lot of thought and passage analysis that is similar to VR.
