Are the 10 courses coming from an accredited program? Like will you get course credit for them that will transfer to a university if you choose to reapply?

As a current college student, I think that taking 10 courses could definitely improve your GPA. Obviously, it depends on how well you do in those courses. But 10 courses - that's a good chunk of work. Depending on how the credits convert, you could be looking at practically a year's worth of coursework (I'm speaking from a USA perspective). You could really make an impact on your GPA with a year's worth of grades added to your transcript.