Hey Kajuna,
When I took the OAT for my first time, I scored a 300 on the QR section and I only used Chad's Videos and followed along with a ton of practice problems with the Math Destroyer.
What happened was that, I disliked the OAT destroyer, because for all the other subjects it was so complicated and so I just sold it away and purchased Kaplans course instead. However, I loved the Math Destroyer, it was chill and made sense. The OAT destroyer was like so much random questions scattered and unorganized, in which I didn't like. I am a very organized individual and when I study, I like to study from the bottom and work my way up.
So I'm not worried about the QR section anymore, because I did get a 300 baseline, I know that I can improve the score, but I'm surprised that Kaplan won't prep it's students for QR.
But hey, for me, I need to still master Kaplans QR and Chad's Videos, because at the end, close to my actual OAT, I will be taking those Kaplan full length practice exams, and I need to score high on QR. It won't hurt mastering Kaplan's QR, I mean it's all math at the end.