Hmm, interesting.

   In my opinion thirty-day span is quite a little time, even to learn to mow grass let alone to be an expert in English.  Of course, there are the geniuses, like my buddy Marcio.  One guy with a memory like a sieve like me would never do well this way. I would need at least a year (with the best expectations!).

    However, I wish you a good trip and try to practice your English in all your free or busy time, enjoy it.

    And don´t take my advice so seriously, I never been abroad. 

    PP.