Final GCSE help in english?

I believe you are not a native English speaker. You tend to write what you hear. As the street language is so poor in this country you are having trouble as you do not know the correct words, just the slang. 'cos should be because. You should say that you have a D. In English Literature not I got.. Now how to improve? You need to listen to good English speakers. The news bulletins should be helpful.Join a debating society . Read good quality newspapers. A library would have these readily available in their reading rooms.Buy a good dictionary. College has no a in it. No one would consider you in higher education unless you show a good knowledge of English. Dont be afraid to ask for help but ask the right people