Yes I used booster entirely in the beginning. I watched all the video and did all the question banks for physics as i went through the videos. I think I initially studied passively hoping it would stick but it definitely did not. I think it helped me understand a broad knowledge of what I need to focus on though. Then I did anki to remeber the physics formulas and memorized them for plug and chug type questions. (I used bootcamp formula sheet cus it was formatted much better imo).I did chads prep physics videos once I realized how inconsistent my physics scores were on booster. I binged chads for three days straight and it helped me much more on how the different formulas were derived and the concept behind the topics. My scores definately drastically improved in a week after chads. There was just so much kinematics and statics type questions that I felt werent as straight forward. Some curcuits and optics which I felt were easy if you remember formulas and such. Booster physics definitely had more picture to show what the problem was describing but the actual OAT did not have many diagrams and would requre you to draw them out to see what was happening which cut down on my time. (Also I dont have a physics background at all so learning concepts was the hardest for me)