It depends how much you can absorb in.

It should be possible if you have enough time to spend on the languages and they are not too similar. I don't think there is any scientific evidence against it and there are many polyglots doing this. Besides this, in Europe most children learn multiple language when in school. So it is definitely possible.

Thanks guys!

Hi Ruhige. It depends on how many languages you're learning and if you're spending the same amount of time on each of them. It can become quite confusing but it is possible. One to two languages at a time is what I'd recommend, because even two is a lot for the brain to take on. I used to teach English in Prague, and most of my students were from Russian speaking countries, and during the academic year they were studying Czech most of the time and English with me part of the time. During my classes they would often speak in Czech by accident, and they would often tell me that they would automatically think in the Czech language first before speaking to me in English. So it depends on the person really, but I'd say one to two at a time is enough. I'm learning Norwegian myself and trying to learn Spanish on the side, and even then I think in Norwegian first sometimes even when asked questions in Spanish!