It's definitely all about what your goals are. If you haven't done this before, you probably won't know what it takes to get to certain levels(i.e. how much ef

It's definitely all about what your goals are. If you haven't done this before, you probably won't know what it takes to get to certain levels(i.e. how much effort and time). Also, the distance of the language from your native language plays a key factor. I have reached b2-c1 level myself in only 2 languages, plus b2 in a few more, and a2-b1 in a few more. Some languages I just want to be able to have basic interactions with to speak with a neighbor or a person I always see at a restaurant. Others, I have a personal connection to and want to get to a really high level. It all depends on what your goals are. If you intend to study 3 languages at once, make sure you're very organized. You should track everything and have a plan for exactly what you intend to do in each language before your day starts. Also, realize that each language will move no more than 1/3 the speed that focusing on a single language would. Final comment: if you've never learned another language before, I highly recommend to just take 3-6 months and dive into whichever one interests you the most.