If you can become fluent in 5 months, more power to you. I certainly did not mean to be offensive. I would like to say, though, that just because you can speak, read, and write a language does not mean that you are fluent.
I myself learned two languages (in addition to English) the way that you described: intensive study combined with total immersion. I spoke virtually no English for virtually 1 year for both of the languages living in both Nicaragua and Germany. Though I was able to speak, read, and write both, I certainly will not be arrogant enough to put on my med school application that I am fluent in either! Conversant and proficient, yes, but not fluent. There is a big difference. Fluency takes years not months, unless you learn the language as a child. . . even if you learn it a intensive environment.