What would you do if you did very poorly of a test?

I always made excellent scores on my tests. There were times I perform very poorly on a test. It was mainly because of the structure the test. I would study more often for the next test and be more prepared. I would also ask for assistance to clarify why I performed poorly on the test. Most people are use to failing tests, im the type of individual that will try my hardest to not fail an exam. I would forget that I exemplified poor performance on something that I could have achieved. There’s nothing much to do when one fail a test except to focus more on the next test and make sure they do not make the same mistake as before. I make sure I do not fail the major tests like the finals or mid-term exams. Poor performance on a test is not necessarily bad; it could cause some good outcomes.