I'm the same way

Three weeks into the school year, I already had 4 missing assignments, which meant I was failing one class. My grade went up when I got the papers in, but still. It freaks me out, because grades in high school matter. But I just can't bring myself to do the homework when I'm supposed to.
I hope you get some suggestions, I'm looking for some too
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Only you can prevent neurotypical jerkiness!