Locate a copy of the Solutions Key and a blank answer sheet.
Fill in the blank circles on the answer sheet that correspond to the correct answers from your Solutions Key.
Punch a hole through the answer sheet over the filled-in, correct answers.
Lay the hole-punched answer key over each student's answer sheet. Mark each circle on the student's answer sheet that shows up blank through the holes on your answer key.
Record the number of marks that you made on the student's answer sheet as the number of incorrect answers. Look for any questions left entirely blank. Count up the number of filled-in questions that you did not mark. Record that number as the number of correctly answered questions.
Consult the Solutions Key to for the equivalent adjusted score for the number of questions correctly answered on that particular practice test.