Since you have studied in France, I assume you have done one or several internships (usually 6 months) or even one or several years of apprenticeship (really common here in IT)?
If yes, did you try to get a job in the same company? Did you ask for references to your manager, your product owner, your team members, your CTO?
If no, you should start with an internship I think. Unfortunately, what your learn at school is rarely useful in your daily job. I don't know any company that hire candidates without some real xp.