I'll be taking B2 later this year. Will that be sufficient if I get good marks? Also, when you say it's the closest equivalent do you mean that it qualifies one to practice law in common law countries?
1. I am not an expert in law, but no France is to my knowledge not a common law country and in addition it definitely won't qualify you to do law in England, thus it is no LBB, but a qualification in French Law.Wether this gives you exception or advantages in your country you have to ask there, but it would surprise me.
2. Well, B2 isn't that high, exspecially because Law has to do a lot with language, but we don't know you and how talented you are with learning languages.