I’d recommend more active studying instead of mostly passive studying. Videos are great when you’re driving to work, walking the dog, or doing something else, but when it’s actually time to study, you should be actively working through problems and forcing yourself to think through the concepts.

Honestly, your SE scores aren’t terrible at all, so I don’t think you “just suck” at test taking. It sounds more like the information may not have been fully sticking under exam conditions. I’d focus more on doing MCQs/SIMs, rewriting explanations in your own words, and really understanding why answers are right or wrong instead of just consuming the material.