I have associates degree in electronics tech and did go for my full engineering degree, but failed out...twice. I cannot for the life of me reliably pen-and-paper-clock-ticking solve complex equations. I even payed out the ass for a top tier tutor, no luck. I very firmly reached the "Maybe this just isn't for you" point. But with my own work and in my job, being really bad at high level calculus or diff eq has never even cropped up much less been a detriment (Well it does crop up, but in the SPICE simulator/circuit simulator).
Oddly enough the engineering lead here is an uncredentialled engineer, but he was also the first employee 25 years ago so I suppose he is grandfathered in. Not that he doesn't deserve it either, he is wildly knowledgeable and capable.
Are you able to do the homework (without aids) but not the test?
You might have some form of diagnosable learning disability. If you get that diagnosed and then take it to a college's office of disability support services (or whatever the equivalent is), they'll set you up with a set of accommodations, which is generally things like more time on tests.
Oddly enough the engineering lead here is an uncredentialled engineer, but he was also the first employee 25 years ago so I suppose he is grandfathered in. Not that he doesn't deserve it either, he is wildly knowledgeable and capable.