"Hello everyone. I am a senior in college and I graduates this year. My major is print ads. I also own a tutorial.  I hope to make some friends here and would like learn English better with them. And oh, I also don't want to be disturbed too much because I am preparing for the postgraduate entrance examination."

Good introduction. Although there are some errors. I tried to correct based on my understanding of what you wrote. I couldn't fully comprehend what you meant by '..now own a tutorial..' and 'want to make some of the quietest on through here..'. 

Good luck with your entrance exams. Best regards.