TOEFL, GMAT

Hey,

I don't know programs for TOEFL or GMAT in France, but I have experience preparing for both exams.

If you would like to prepare for your exams in the U.S., you can easily find language schools that has TOEFL preparation course in any city. It is one of the most popular courses for language schools to offer. 

As for GMAT, I heard there is preparation courses offered by Kaplan (http://www.kaptest.com/gmat). A friend of mine took it, and she was satisfied with it. Also, my quick google search also shown Veritas has centers in Europe, including Paris. http://www.veritasprep.com/gmat/full-course.html

I think the GMAT math should be really easy for you. The tough part is English, because it's challenging even for many native speakers. I didn't take any courses for GMAT prep because it was expensive for me. I did, however, got a GMAT book and met up with a English toutor 2 hours everyday for a month to prepare for it. The test score was not super high but good enough for me to enter the program. 

Hope this is somewhat helpful.