In the practice professions (Doc, Law, accounts, even "blue collar" ones ) - experience is much more indicative of skill than test scores.
So as a thumb, you want to ideally go to the brain surgeon who's done that surgery the most.
So as a thumb, you want to ideally go to the brain surgeon who's done that surgery the most.
No formal testing means no formal education which means a lack of important detail. You know how you learn the details on the job? By screwing up the job. You gonna let Eddie The Trainee Surgeon work on your brain after leaving a medical school with no grades?