Thank you very much.
Every year, we issue study permits to thousands of bona fide francophone African students to come to Canada and Quebec. The approval rate for study permit applications from clients who want to come to Quebec from French-speaking African countries is comparable to that of clients who want to come to other Canadian provinces.
As to what exactly happens, I can tell you that applications are reviewed on a case-by-case basis, according to the same selection criteria, regardless of the applicant's country of origin or continent of residence. I'd say there are three main reasons why applications from Africa are more frequently refused.