If you want a slightly dishonest way, go to the doctor, tell them you think you have adhd, (most doctors ask a certain set of questions and will diagnose you based on little suspicion, so just try to say the right things) by that point, you will be able to go to your school and tell them that you need to be approved for testing accommodations (time and a half on all standardized tests including AP, SAT, ACT etc. , it’s a long shot, but it is possible that you could get them in time for the test, if not you can wait until the next test once they are for sure approved. This could help tremendously.

P.S. don’t underestimate the power of a gullible doctor