Calculating Final Course Grades: What about Dropping Scores or Offering a Replacement?
Instructors commonly cope with a missed test or failed exam (this may also apply to quizzes) by letting students drop their lowest score. Sometimes the lowest score is replaced by an extra exam or quiz. Sometimes the tests are worth different amounts, with the first test worth less, the second worth a bit more, and the third worth more than the first two—but not as much as the final.