MDPT scores are valid for three quarters and must be used within that period. This means that students may skip two quarters of math enrollment but may not skip three quarters. This includes Summer Quarter. Students who do not use their MDPT scores or grades within the three quarter limit will have to retake the MDPT. Note that placement is made on the basis of valid test scores or course grades, even if that placement is lower than course work previously completed. Students may not take two MDP tests whose periods of validity overlap by more than one quarter.