Career change advise?!?!? Medical to Architectural?

I am studying veternary med and my boyfriend is studying architecture. I dont really understand alot of it but I am also bad at math. The other thing I cant understand is the gradeing there is no clear cut way of grading cause I am use to if I do the work right you get a good grade but architect is all about if your teacher likes it not even if you did in correct. Thats my two cents, but I live my life by the standard do what makes you happy not what make you money, so do what make YOU happy not your mom!