I don't think being a pharmacist would help you much to pass this test. It is about cramming and memorizing a whole bunch of random information that you may not use it in the future. With a score of 50, you definitely need to increase your studying hours. Don't just rely on the law part to pass this test. Start studying again RxPrep, PNN, or whatever study materials you have and make your own notes. I use quizlet myself and per brand/generic, I add few important information about each drug. I like having my own notes vs using available notes online because I retain information better this way. Before your next attempt, use a Qbank and check your readiness (average scores 70-80+%). Now you have taken this test, you should know how it is like.
I cannot really tell you how to prepare. This test makes no sense. Just do your best.