Apprentice curanderos in the new course cycle, unlike in the old cycle, have to pass examinations to prove their abilities. Some of them, less than half of those who started the courses, have just passed the test that admits them to the traditional apprenticeship.
The traditional apprenticeship in Amazonia is similar to a doctor’s residency or internship after graduation. In this apprenticeship, apprentices engage in helping people who need help and in performing curanderías in order to put their acquired knowledge into practice and increase their experience.
All apprentices are very good or would not have passed the tests that got them into the apprenticeship.
You will find the list at the bottom of this page of experienced Curanderos in Traditional Amazonian Curandería.

IMPORTANT! Self-styled curanderos promote themselves by claiming to have been our apprentices, but if they are not included in these lists, the reason is not purely technical: it means that they either failed the exams or that, having been admitted to the apprenticeship, they interrupted it. They are people with deficient knowledge or, worse, who have become discouraged or offended by a failure – such as a missed exam or otherwise – and have not demonstrated the necessary qualities of courage and strength (ánimo y fuerza) to handle Power. I strongly advise against addressing any of them. As for the alumni of the old courses, the valid ones are listed in the section at the end, others of my former alumni of old courses are not even worth considering