I know I am way past the deadline but can I still cancel. No, the last day to cancel would have been 8/13
Will it show if I cancel and will it count as an attempt? Whether you go to the test and take it then void it, or just "no-show", it will show up as one of your attempts. It usually takes about 24 hours for the registration system to update your account showing you took or missed an exam. After that you can register for any available appointment. Remember you can only register for one exam at a time.
Also, can I cancel this exam and sign up for the september test date? Thanks! No, it is too late to cancel.
You will probably have to wait until 8/24 or 8/25 to be able to register for another test.
I see from your other posts that you are planning to apply in 2026-2027, not this cycle. Retake the test when you feel ready, or apply to schools within the range of your current MCAT score as advised in your prior post.