That depends on the test, and the training surrounding it. If I'm hiring for a job where there's a strict requirement to be 6 feet tall and there's nothing can

That depends on the test, and the training surrounding it. If I'm hiring for a job where there's a strict requirement to be 6 feet tall and there's nothing candidates can do to get taller - then once you've measured under 6 feet there's no point in re-testing you. If I'm hiring for a job where there's a strict requirement that you be able to lift a 90 lbs weight, a lot of people will fail - but if they hit the gym, in a month or two they'll be able to pass easily. If I'm hiring for a job where there's a strict requirement that you be able to lift a 90 lbs weight, but before the test every applicant goes through a 6 month strength training program, so we test them at absolute peak strength? Re-testing would be a waste of time, except in a few cases like if someone had a loved one die just before the final test. If I'm hiring for a job with a written test, the test draws a random selection of questions from a question bank, and some questions are much easier than others? There might be a substantial random element to the results. If re-testing people produces substantially different scores, probably that indicates I need to improve the design of my test.