Assign points to each problem based on its difficulty. Often, teachers assign the same number of points for the same type of questions. For example, if your test consist of 5 true or false, 10 multiple choice, and five short answers, you can assign 20 points for the true or false section, 30 points for the multiple choice section, and 50 points for the short answers section. Then, each true or false question equals four 4 points, each multiple choice question is worth three points and each short answer question is worth 10 points. You can also give different points to each problem.
Add all possible points by figuring the total of all possible points for each section of the test. The sum of the points need not to be 100. If it is exactly 100, it is easier for students to compute their percentage score because their raw score is already the percentage score. If the sum is not 100, proceed to Step 4.
Grade the test based on the assigned point system. For each correct answer, students earn the assigned point for that problem. Put the number points students earned on the margin of each section. For example, if each true or false question is worth four points and a student got three or out the five problems correct, then this student has 12 points in this section.
Add the points the students earn and divide it by the total possible points. That means divide the number you obtained in Step 3 by the number you obtained in Step 4. This is the percentage score.
For example, if a student got 56 points out of 78 possible points, then divide 56 by 78 and the percentage score is 72 percent.