I was kinda the opposite and didn't think Chads videos helped me a bunch for physics. I needed more application based practice problems to learn the material... Destroyer is great for learning that but since your low on cash I would suggest getting a physics textbook and going through the material. I've always heard that physics Princeton review book was good too (cheap) ..?
Physics is my weak point (it's always been hard for me) and I raised my section score from my first OAT attempt to my second OAT attempt by 50 points solely using my college material and the physics destroyer.
Also khan academy videos are great too and available online for free