Need to practice english

Hey guys. I need to practice english, i'll be moving to London next year, and I have to be more prepared. When reading through some of the gaming forums, I see words which I know and are used well in the syntax of the sentence, but I never use them and use replacements, that's one of my problems, words such as hence, despite, etc is that a mistake? Also how can I pracitce my english? Any suggestions are welcomed. Except the troll ones.
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