For immersion students, different factors are at play. From elementary school through high school, immersion students and their parents, who often have an important role to play in decisions on post-secondary education, must be informed about the programs in French and the support for immersion that universities offer. Students are unaware that it is possible to successfully continue their studies in French. Some high school students decide to study at university or college in English because they are afraid that they will not have as much success if they study in French.
You need to know that a number of our universities provide support programs through which the students can get individual help from teachers in correcting texts with a view to increasing their chances of success. At the post-secondary level in French, all kinds of mechanisms can be put in place. But they do not exist in all our universities. Some larger universities such as the University of Ottawa and the Université de Moncton can help people, but other smaller universities would need help to be able to support immersion students.
To answer your question in a nutshell, I will say there is a great need to make the possibilities in French understood and known. Often, students are under the impression that, if they are in immersion from grades 1 to 12, they can get a bilingual job and use French in the job market, but that is not always the case.