[MengerSponge]

Different tests challenge people differently. It may be that you only needed an accommodation in computationally heavy exams.*

Truthfully, my mention of accommodations isn't for you--I'm assuming you're out of high school already and you've found a professional niche that works for you. I mention test anxiety and the professional workarounds for high schoolers or their parents.

*) This is actually moving well beyond my expertise. I know about the existence of test anxiety, and I've accommodated students with it.

A brief consult with Dr. Google surfaced some clinically recommended accommodations that probably would have helped you. Sorry I don't have a time machine!

http://www.2enewsletter.com/article_2013_05_slow_processing....

This one's my favorite: "Reducing the number of tasks required to demonstrate competence (such as 5 math problems instead of 25)"