We will change those to real aliases as soon as possible. H are homework grades. H1 refers to Homework 1. H2 refers to Homework 2, and so forth. All homeworks are out of 100 points.
Q are quiz grades.
Q1 refers to Quiz 1. Q2 refers to Quiz 2, and so forth. All quizzes are out of 10 points. E are exam grades. E1 refers to the first midterm.