First of all, may I ask where you are located by now? If you are in the states, then there is a very good way to improve your writing. It doesn't take a super-famous school to improve one's English anyway. If you are in any big-city, you shouldn't have any problem finding one of those 'technical institutes.' Sign up for technical writing for a semester or two. You will see the improvements yourself. Those whatchamacall "Technical institutes" *or in Korean, 전문대* are especially good since their matriculation process is not that hairy - and most of all, those who work there are not that bossy. Also there is no 'due' date, up to which you have to finish the paperwork. You can walk up any day and sign up for one sooner than you think. Just, remember that they won't "feed" you the stuff you want. You have to work on it. They will, nevertheless, help you as much as you ask. Hope it helped. Laters, then!