So I assume you want to learn about creating game art (not game production), if you want to go to art school. If you go to art school, you're going to be creating an art portfolio and seeking an art job (not a producer job).
Read
http://sloperama.com/advice/lesson7.htm
and
http://sloperama.com/advice/lesson34.htm
for starters, then perhaps you could rephrase your question.
Also, "best" is subjective. Only YOU can determine what school is "best" for YOU.
http://sloperama.com/advice/lesson25.htm