How do you learn a subject when it’s not something that really interests you or that you feel is a waist of time?

Walburga Y.
Well, you can either try to find something interesting in the subject or try a fun way to learn it. For example for every few pages you read or for every few questions you answer you reward yourself with a treat or with a little break. You culd also try learning with mind maps. I am still in school too so this usually helps me. Hope that I was eable to help you!