Partner, I've met people who have passed all kinds of tests and received various certifications.  Many would starve to death in a MacDonald's with a ten dollar bill in their hand.  Most of these people are English teachers.

Going to the USA means very little.  I've known many (many = 100+?) people who have lived in the USA for years without learning much more than "Hello."  The dear mother of some old friends lived in the USA for at least 40 years.  The only thing I ever heard her say in English was "Hello.  How are you?  Sit down please."  No, that is not an exaggeration.  On the other hand, I've met several people in Brazil, Nicaragua, and elsewhere who learned to speak excellent English without leaving their countries.  Going to the USA is not a cure-all.  If you go with motivation, you can learn a lot of very practical vocabulary and you'll never run out of chances to use English.  But you need to be motivated, not give a tinker's damn if what other people are going to think of your accent, and talk, talk, talk.