Since you only have a month I say do as many practice test as possible, and brush up on topics in the sciences that you may be uncomfortable. Keep in mind that the OAt is like the lottery, you can study but you can never study it all, and you never know what type of questions you may get. I took ithe OAT twice, and the best thing you can do is work on timing, pace your self, skip through questions and answer the ones you know for sure, don't waste time on questions where the answer doesn't pop out at you. Do what you know and when you have like 5 minutes left make sure you have an answer for every question. The OAT is about knowledge somehwat, but you can out smart the OAT by answering every question. SOmethign is better than nothing, and you will obe surprise how many more questions you can get right by guessing. 2 more correct answers could be the difference of like 20-30 points. Good Luck, study a little bit every day, and if possible get a study buddy! 🙂