A make-up exam is a test that is taken by a student who has missed an original exam due to extenuating circumstances. The two crossword solutions for the term 'make-up exam' are 'retest' (6 letters) and 'ASSAY' (5 letters). Retest means to take a test again, while ASSAY means to evaluate or analyze something. Therefore, a make-up exam is a test that is taken again in order to evaluate or analyze the student's knowledge.