tests.

It seems like mosts artists don't like school. There are probably all kinds of reasons but artists are generally creative and school is generally tests and tests are not creative. 

Tests are memorization. They are predictable, certain, standardized, and judgmental by their very nature. They produce hierarchy and obedience.   

Creating is not and does not.  

If you want to be an artist, you don't have to take the tests anymore, but it's like we become addicted to them.