Whether any form of training can really imbue a student with skill is questionable. Skill is like a delicate seedling: the teacher can try to provide the right conditions and after that everyone can HOPE that the student manifests skill by mysterious processes.

Of course, conventional classroom methods such as tests often suffice to filter out most students who have not manifested the proper type and degree of skill. But many students test well in the classroom and badly elsewhere. Relatedly, many students initially convince their teachers that they (the students) are as dumb as rocks, but then those students grow up and are ultimately recognized as skilled.