Thank you for your response. I forgot to mention. In my schedule I had dedicated the last week for practice exams. I had two full length Kaplan exams and the sample OAT practice exam from the ASCO website. During the last week, I was cramming and I would actually work out all the problems on the practice exams and re-try if I got it wrong after completion of the practice exams. Basically, I made sure to use the practice exams to see if I mastered the concepts. I found that the level of difficulty for Biology on the real OAT was not similar to the practice OAT exam from the ASCO website. It was more difficult compared to the practice exam.