To become a brew master through school, they do require a lot of prerequisites, but if it is something you are really serious about, do whatever it takes. I got accepted to the Siebel Master Brewer program for 2014 and I did not have a formal education in science or math. Instead, I got a hose monkey position at a local brewery, and enrolled in the Concise Course at Siebel. I did the 2 weeks in Chicago, and it was a wonderful experience.
Its not that they don't want you if you don't have all the requirements, its basically due to the fact that the class moves at such a quick pace, that it is really good to have a working knowledge of commercial brewing already. It is true that homebrewing experience doesn't really factor into your enrollment. Its nice if you are a homebrewer, but the class is focusing on large operations and doesn't even mention the word homebrewing.
In one of the brewing education posts on here, i gave a "review" of the concise course, so you can find that if you are interested.
I will say that UC Davis has a lot stricter requirements than Siebel, but that is because UC Davis is primarily science.