I decided a few years ago that I would learn both Japanese and Chinese. I studied Japanese for about a year a half during my first part of college. Right before I left the states for Taiwan for a semester, I applied to a university in Japan to transfer to. I got accepted and a full ride, but pushed it back one semester to stay in Taiwan longer. Well at this point, having studied Chinese for 6/7 months in Taiwan, I have forgotten almost all my Japanese but my Chinese is at that point where it is finally starting to take off. In January, I leave for Japan. I am worried that I will loose the progress that I have made in Chinese. I have actually been looking around Taiwan for a university to transfer to because I would rather be really proficient in one language than just ok in two.
So here is my question. Is it possible to study two languages at one time and be more than just "okay" in both? How do you do it?