It is writing it on paper which is the issue. I would struggle a lot less when writing it on the computer (without autocomplete or anything related). How do I

It is writing it on paper which is the issue. I would struggle a lot less when writing it on the computer (without autocomplete or anything related). How do I know? because when I make my practical (school) assignments (which I do in Sublime Text without autocomplete) I complete the assignments within no-time. This is, somehow, not the case when doing it on paper.