For a few people, taking a test can be a traumatic experiance. Some people don't take tests well but are very good with tactile tests.At our institute, we have tests that are already made up. We as instructors don't change them. I will however, proctor make-up tests at the convience of the student. Now there has to be some specific time frame agreed on and adhered to. If left go long enough, the student will loose the info and usually will do poorly on the test.