MCAT’s are an important aspect of application to medical school.there are different type of medical school as allopathic medical school, osteopathic medical school, osteopathic medical school that have own criteria to admit students.

Here I give you information about it as follws:
low MCAT score (i.e. less < 30): trouble getting into an allopathic medical school.
very low MCAT (< 23): will probably not get into an osteopathic medical school.
Lower than 20: you will still get into a Caribbean school, but you will probably not pass the boards.

Here I list some Medical Schools in Canada, for example, do not require students to submit MCAT scores.
Dartmouth Medical School
University of Ottawa
Brown University and the University of Rochester medical schools