Hmmm, I don't think that a 2 week program will really improve your french skills.
As a matter of fact I am a lawyer and I got my master degree in France and currently I am applying for my PHD.
I learned a lot when in France, but honestly, what really made the difference was the huge amount of study I did in my own country. ( I am brazilian)
Two weeks speaking french isn't enough, I guarantee you that.
The language you use when talking to friends, at home, in stores, in the streets is way different from the "academic language" you must have for your law degree, and specially when dealing with french people who are extremely demanding with their language.