OP: You used the best resources available for this section. As Cornfed said, it's a good idea to do AAMC a second time. More books and videos are not going to be high yield. You need to master how to take that section. If you are looking for more exams to do, I would recommend TBR P/S from their FLs over Altius (I never did NS). I recall being flustered when I first did them thinking it felt like CARS 2.0 on their practice exams. Then on the real deal, it was CARS 2.0. Of all the practice materials I did, and I did a lot of different resources, only TBR FLs nailed the CARS 2.0 feel and had realistic topics, based on my N=1. I didn't use their book, I'm only talking about their FLs.