You did pretty good actually so don't give up just yet! I am not sure how they average together these marks but from what i gather the percentile compares you to the pool of people who took the test with you. So for example in the reading comp section you got 93% therefore only 7% of the people who took the test in your comparison pool did better then you. Its hard to say if you will get in for September because the averages are usually higher then for example a JAN start date. Good luck!