Well, if you mean when you are taking the real test starting with Ochem, not really. You would have to skip through 70 questions which would take a couple of minutes and then start on the Ochem questions, then go back to the general chemistry sections and then the biology, which would waste several minutes of your time. Having the chemistry questions last I think is good because if you take a little longer on the the Bio questions you can always zip through the chemistry sections at the end, and then go back to the biology questions that were difficult if you have time. Just mark the ones you are not sure of.