Total Score header Click here to select the total scores for column operations such as sorting students, calculating statistics, and plotting histograms. Student scores A regular score can be a positive number, an absence, or a truant. An extra credit score must be a number, positive or negative. You can enter a score as a percentage by typing a percent (%) sign after the number. The Main Worksheet This window displays the main worksheet for this class. The upper left corner tells you how many students and assignments are in the class.