i feel you i wasnt diagnosed until i was 21 i also have bipolar disorder that appeared as depression throughout high school i was told i was smart through school and i would perform well in tests and exams but i wouldnt even hand up assignments due to not being able to get my shit together i didnt finish but i was accepted into uni based on an aptitude test i do well whenever i am not impacted by major depression but the feedback in how to pull my grades up from pretty good to excellent is to not make careless mistakes to actually read over what ive done which i struggle to do because of adhd i even sat an abbreviated iq test as part of psychology studying whic confirmed that yes im smarter than average im stuck feeling like im holding myself back and that ive received sympathy grades instead of accepting that maybe i did actually achieve that