The Kaplan Physics section is significantly more difficult than the type of questions you will see on the actual OAT. There are many threads about such topic, with direct comparisons of scores on Kaplan vs the real OAT. For me personally, I scored 300-320 on the Kaplan physics and got 380 on the real OAT and 390 on the opted sample. I do think, however, that doing the Kaplan problems certainly helps- just don't get down on yourself if you are not performing as well as you would invision. Hope this helps