I would think that with your current educational background, you probably already meet the requirements for Medical Assistant (MOSID 00150) in the Reserves.
You need: Gr. 11 Ontario or provincial equivalent (Québec Sec IV equivalent for all courses) with an Academic Profile to include Gr. 11 Biology, Gr. 10 Chemistry or Physics, and Gr. 10 Mathematics (Quebec Sec IV, Math 426, or 436). For the Gr 11 Bio, they want to see General Biology or Human Biology equivalent. For Quebec: Biology: Sec III (314), or Sec IV (534), or Biologie Humaine 101-901 (distance education- Cegep level).
You also need to meet the Canadian Forces Aptitude Test (CFAT) cut-off of the 20th percentile on the Problem Solving Scale.
And finally, you have to past the FORCE (fitness) Test.