Choose whichever you most enjoy and whichever you think you will get the best grades for. Most people who want to be lawyers tend to choose subjects like History... not saying you should. French is good as its a language and can be very helpful if you become a corporate lawyer. Geography allows you to be aware of current situations which is also quite good. I'm guessing you're doing GCSE so I'll advice for you not to really stress on this. If you have any universities in mind, look for what a level subjects they require to be taken for law, then try to tailor your choice to that? Only a suggestion.