Motivation to do school work

I just can’t me motivated to do any school work at all, so I’m known as a procrastinator and lazy guy. I want to fix this: the school year started 2 months ago for me and I already have a missed test-submission, and 2 submitted 10+ days after the set date. I also don’t study for tests sometimes as a lazy thing but when I do I study for a lot.

Any advice?