I think the DALF is the way to go. Try for the C1 if you can. I did it in December, it's just a really long exam: listening, reading and writing all in one block, then usually on a separate day the speaking component. There is only a small fee to sit the exam. The good thing about the DALF/DELF qualifications is that they are valid for life.
If you do want to do the DALF C1 though, even if your French is perfect you'll need to be informed about the structure of the test itself - you have to write a synthese (and an argumentative essay) for the written section, so even if your French is flawless you need to know what a synthese is and how they want you to write it. It's not very difficult but it's best to know ahead of time what you're expected to do.
If you do want to do the DALF C1 though, even if your French is perfect you'll need to be informed about the structure of the test itself - you have to write a synthese (and an argumentative essay) for the written section, so even if your French is flawless you need to know what a synthese is and how they want you to write it. It's not very difficult but it's best to know ahead of time what you're expected to do.