i haven't personally done two languages, but a lot of people in my year did (i just finished my gcse's). if it's something you're passionate about and are good at and are willing to do, then it can be great. if you don't have an interest in languages, though, that could create some issues. it's a personal choice really, but don't just do something because you're good at it now because without interest it's difficult to succeed in a subject.