Slow release and a therapeutic dose is significantly different than slamming back meds in school like that. Therapeutic dose means you can’t even tell you took the med, until you either stop or look back at the day and record how much you were able to achieve.
Yes, some doctors are bad and calculate a dosage based on weight or other arbitrary means. Good doctors and psychiatrists start you on the lowest dose and slowly titrate you up based on DSM guidelines.
Lastly, medication for ADHD is something that makes all the actual effective treatments do-able. It’s a first step not a crux.