Making sure your brain is functioning well, be this after an illness or just for general knowledge, can help you spot issues long before they affect your life. This isn't always the case, and it depends on the test and what you're concerned about. It's also not something you'd do very often due to cost and time. But testing your brain's performance at least once can give you valuable information. The tests you might face differ in their goals, but they are generally divided between neurological, imaging/physical, and cognitive.