This worked for me up until Algebra 2. Up through Algebra 1 I'd just do everything in my head, never show my work, and thus solved a lot of problems using non-standard/creative methods on the fly. Ended up hurting myself a lot. I didn't have any muscle memory for solving the trivial parts of problems as I progressed from Algebra 2 through BC Calc. This led to me choosing a non-mathy degree in undergrad.

I could breeze through higher-level logic courses, but was essentially remedial for higher-level math.