Read.As much as you can.I too live in a third(or maybe a two-and-half?) world country.You have the internet with enough number of things and articles to read.Start with small novels if you want(Enid Blytons,Franklin W Dixon etc) and move your way up.
I live in a developing country as well. Watch as many English cartoons, shows and movies as you can. Most of the media you consume should be in English as well. Try to visualize the words at the same time you hear them.