Homework is only worth 7% of the class, so even if you do all your homework for 3 months and have a perfect grade in that category, one bad test/quiz grade will wreck your final grade since tests and quizzes are worth 70% of your grade. I honestly think it's ridiculous how the grading weight is distributed. Also, maybe it's just a distance-learning thing, but the teacher rarely has time to discuss your grade and often postpones helping out with any problems you might have until the very last minute. Tldr; homework isn't gonna help your grade much and you have to pay attention because the teacher most likely won't have time to help you.