They are often artists, musicians, puppeteers etc. They like to get involved in cultural and scientific fairs, as long as they are not forced into it. Polymaths do not like to be forced to do anything. They tend to be intellectually rebellious. But they usually catch up on their school work in the nick of time because they read and write well, which is the real key to academic success.
Polymaths especially like to write, which is the same as serious thinking.
Polymaths eventually surpass all their peers in academic performance even though they often find what they are forced to learn in formal schooling to be trivial. Successful polymaths always respect the opinions and the person of others, especially teachers, who are usually very dedicated people. There is no greater ignorance than the presumption to look down on someone else. It is a truism perhaps, but you can learn something from almost anybody. Polymaths have common sense too, are practical as well as intellectual.