Can I get direct admission for a master's in Biomedical Science in Canada after completing 3 years bachelors ?
Conspiring 75% is a normal passing grade in many masters programs in the USA and Canada your ability to get into a masters program when you have not shown your ability to attain that sort of grade is marginal. That GPA means you have not mastered the material
When students are selected from the applicants they work from the top down. At the best schools they attract those with the highest scores. As they work down the list chances are that all the positions in class will be filled before they get to you.
The lower rated schools may get as low as score if the quality of the other applicants is not very good. But for sure all the funded places will have been taken before they get to you.
This means you have a chance at the lower rated schools. But as for the top schools that will not be you.
You can correspond with the registrars office at various schools in Canada by email and see what they say as there are no rules that apply to every school.
It also depends on your field of study. The ones that lead to the highest paying jobs attract the best students.
In your case with such a low score will be far down the ladder.