how many practice problems have you done? my PS score went up after I stopped reading lectures and started doing problems from the 1001 EK books and going over incorrect answers. i found the 1001 book to be good for chem, it might be helpful for physics if you just do problems in your weak areas. actually, i think i would recommend you getting the physics lecture book (maybe rush delievery from amazon?) because they have 30 min exams in MCAT format for each chapter and questions after each lecture as well that may be helpful to you. good luck.
