-Write essay or blog in English. Check your grammar mistakes everyday. That will help a lot.
-Delete all of your Mongolian songs from your MP3 player and only listen to English musics.
-Watch your favourite movie (An English movie which doesn't make you bored) in English and repeat again till you completely understand it.
-When you alone in the room or stay alone at home sing a song in English. TIP* You can sing while reading lyrics and sing with the song. No one could hear you.
-Hang out with a Cool native English speaker, But I recommend white people. Because they only speak English with you. You could get a Language Exchange partner. Cool guys always talk something very interesting and they must help you get that "what did they mean". But nerd white people could laugh out if your accent is ridiculous.
-If you are a beginner English speaker or a learner, I strongly recommend *Don't try to speak out like an American or Briton. It is really doesn't matter about accents. Everyone has accent. Just say words clearly, make less grammar mistakes and don't be shy. If you speak fluently in 100 hundred words they would think you are cool and smart.
-On the one hand you can Buy a Book which is expensive (should be over 5000tugrik), interesting and popular. On the other hand you can get a library member where has so many English books.
-The most important thing is think as English in your mind. You really can do it. For Example: 'Someone asks you to go out for a movie'. You need to respond it. Just think in your brain like this -I would go with you, but I am busy. I am sorry. I will must go with you later. Or /Sure, I definitely go with you. Thank you so much for inviting me etc.., And actually you can answer it on your own language.
-Altough Number of white people is increasing year by year, But English speaking environment is still poor in Mongolia. You can create a Group which always speak English, then invite your friends, classmates, even your family members and acquaintances. You really can do it. Who dare laugh on you when you speak English. They should be losers.
Really like wht u u suggested, especially d last part, the creation of english talkin group...
Put in your mind