Learn English as it is really spoken, not what the textbooks say.
BSc(Hons) Computation, specialising in computational linguistics
Member of the Institute of Electricians and Technicians (i.e. a qualified electrician)
I don't tend to have much other paperwork. I am more practical. I think I have a certificate somewhere saying I can speak Hungarian. Certificates are not important:being able to get by in a language each day is more important. The rest is what dictionaries are for.
I got 140 in Scrabble the other day, for DRESSING over two trebles. Not even a very high scoring set of tiles. Seeing patterns is how you learn language.
Experience: 15 years
I am a native English speaker living in Hungary. I speak several other languages besides English and Hungarian. I have a lot of textbook resources old and new for how English should have been spoken (e.g. Fowler, Gowers, Partridge and so on). I can also do some deaf sign language and tic-tac on a racecourse (Hungarian: hippodrome). This is useful because language is a living thing, it is not encoded in a textbook. Sometimes I edit at Wiktionary, more often at Wikipedia. Edit, by the way, is a back formation from latin "Editor"!