I'm afraid my daughter is going through the same. High school was no issue with the short assignments, but time management for university is a disaster. I've got no clue on what to do for her. She's undiagnosed. It was never mentioned by any school counselor but the pattern matches with what I see here.

[–] DokPsy@lemmy.world 4 points 2 days ago

Recommend looking at behavioral therapeutic techniques if a diagnosis is either not available or desired

Example:

https://acp-mn.com/about-acp/blog/cbt-exercises-for-adhd/