such a short period. 15 to 20 courses for Computer Science are HUGE.

I also suggest you read English formal publishes everyday from today to
improve your language sense. Your English reveals that you think in Chinese
when you use English. That's what I used to be. If there is any chance, find a
Canadian girl friend for you. Rumors said that one night with a canadian girl
worths 5 years of English learning. Believe or no.