How did You study for QR section?

Hi I am currently watching the videos from kahn academy that dat bootcamp told me to watch. Is there another source I should use in the learning part for the qr section. I want to practice as I watch these videos but I dont want to use the pracatice questions on DAT bootcamp yet. What works best on how to study for Qr since I heard it is difficult?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums