I'm in the same boat as you (47 4/5/5). I took it back in December and will retake it in 2 weeks. This time I am taking a lot of practice exams to improve my OAR score. For the PBM and the rest, I'll keep using the ASTB app. We'll see how it goes...
This is what I saw the last time:
MST: Probabilities (dice, cards, dependent events), square roots, trinomials, dividing polynomials, percentage questions like what is 40% of something, factorials, basic algebraic questions
RCT: Not much to say, it's just boring. I will try to understand what I read next time, I kept zoning out...
MCT: Pendulums, pulley systems (MA), static friction and coefficient, Bernoulli's law, aquatic/atmospheric pressure on objects, springs, projectile motion, the center of mass for spinning objects, pistons, etc...
ANIT: I saw a few aviation-related questions, and some about the Navy and aviation history. I am still trying to figure out how to study for this section, I am using the app.
I am still figuring out what I can do to improve my scores, I am using Kyle's drive more this time.