The information you posted looks great. You have great experiences (professional and extracurricular) and a strong academic record. However, if your target GMAT score is 600 then I think you should aim for a higher GMAT score to be competitive.
Check out this website https://www.canadian-universities.net/MB ... cores.html. It discusses trends in Canadian GMAT scores. The average score attained is 606 however you should read the article for more specific information.