I will suggest you to take the exam and see how it is like. It will help you a lot to study for Oct pcat i guess. I am taking it this sat and see how i do on the test. Even if i don't do well, i can take in oct and get a good score as i will be more familiar with the difficulty of the questions, type of questions, format of the test etc. what if you feel like you are not prepared for the Oct pcat, it might cost u 1 year of your education.