Student of PhD want to improve your english

Hi!!! My name is Sidney, I`m from Ribeirão Preto`s city, Brazil, student of PhD at the University of Sâo Paulo.  I would like to improve my english, because I want to go to the United States or United Kingdom  to do a part of my PhD. So, I must understand on the best way the english language. If you want to talk with me and share knowledge, give me an answer. Best regards!!!!