[pipio21]

Traveling.

It is one thing to study English in a country that does not speak it, and a completely different thing when you need it to survive. Being surrounded by people speaking English(French, German,Chinese) and feeling totally stupid as you can not even communicate the basic means you have to learn or have to learn.

I recommend "fluent forever" book and Gabriel Wyner stuff in general to learn as fast as possible. ALWAYS START BY PRONUNTIATION,like kids do, or else you will have to unlearn what you learned badly.

In order to polish it, I joined Toastmasters.