This score is your grade calculated as announced at the beginning of the course. Each row represents one student.
First row lists a perfect performance on everything.
Columns 2-5 are changes in rank, using alternate methods for ranking, as explained below. If these numbers were all zero, that student would have performed consistently on all graded things in the course. You can find youself in the table by comparing your scores to these. I made up a normalized project score which is the total for the projects, normalized to a maximum score of 75. I computed several ranks to see how the different parts of the score affected the rankings.