Yeah, the job is good for someone who doesn't like routine, this is very true. I did mine through Humber College and they don't require any high school sciences (this may have changed since I did it) but you must do well on the aptitude test to get in. If you are a mature student, that is a plus in your favour as well. By mature student, I mean over 30, not 21, like in university. You would also have to have some relevent experience in the health care field or some lifeguarding background or some volunteering experience in a hospital or something. I volunteered in St. Joe's emergency department and that helped me get in.
There really are no qualifications except advanced CPR; doing well on the aptitude test and having expressed an interest in being a paramedic (the volunteering thing) was enough to get me in. Helping people is a great feeling and there were some messed up situations, so you really do have to have a calm attitude (you'd be surprised how quickly a person will calm down if you yourself remain calm) and obviously you cannot be squeamish at all.