I want a GPA of 3.4 Unweighted but I have a 2.8 unweighted GPA. I'm always unable to focus on homework and I always shake my leg or completely lose motivation. I typed something longer out earlier but my site crashed.
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What I do to avoid this stress is to do homework at school. When it is given, I usually find free time at school when I have completed my class assignments to work on homework and if I don't get too, it's okay, I created a study habit as to when I first get home, I do my work and then do any other activities or relax that way I don't have a huge workload. Your lack of motivation probably stems from exhaustion which is why that extra free time would be helpful.