Grade all of the competed exams. Give the student with the highest grade in the class 100 percent. For example, if there was a possible 100 points on the exam and the highest grade was 97 percent, 97 is now scored as 100 percent instead of 100. This method rewards the person with the highest grade with a perfect score.
Alter the grades of the other students in the class. Through this method, the exam grade of everyone in the class will increase. Multiply each student's exam grade by 100. For example, if one student got 91 percent on the test, you would multiply 100 x 91 to get 9100.
Divide the number you arrived at in step 2 by the highest grade in the class. Following the previous example given, if the highest grade in the class was 97 percent, divide 9100 by 97 to arrive at 93.8 percent. This student's grade just rose from an "A-" to an "A."
Look through all of the completed exams to see if there is a problem that nearly the entire class got wrong. Read through the questions and a sample of the students' answers to see if the question was tricky, written poorly, too difficult or unfair. Think about why most of the students got this question wrong.
Discount the question from the test and set a new high score. For example, if your exam consisted of 25 questions worth two points each, grade only the other 24 questions for a total high score of 48 points. Grade the exams accordingly. For example, if a student got every question correct on the test but the one you discounted, he then should receive a 48 out of 48, or 100 percent.
Declare the discounted question an extra credit. You may find that only one or two of the students in the class got the discounted question correctly. If so, you can decide to use the question as an extra credit question. If there happens to be a student who got every single question right on the exam, including the now-discounted question, his score would then be 50 out of 48, or 104 percent.
Look through and grade all of the completed exams. You may find that the scores are lower than you thought they would be. Ask yourself if the exam or its subject matter was particularly difficult or if you feel the students just didn't study that much.
Boost the overall score of every student by finding the square root of each score. Using a scientific calculator, press the "square root" button and enter the score of a particular student. For example, enter "73" for a student who scored a 73 percent out of 100. Press the "enter" key to find your answer, which is 8.54.
Multiply the square root scores that you calculated in step 2 by 10 to find the students' new exam grades. Following the example from step 2, multiply 8.54 by 10 to get 85 percent. The student's grade rose from a 73, or a "C," to an 85, or "B." This method gives the students who scored the poorest a large boost while giving a smaller grade boost to students whose scores were already high.