I was sent to the U.S for university at the age of 18.?
What are you looking for? a way to cheat the system? With your poor grades why should you graduate quickly? time to grow up, be responsible for your actions and realize you will not get rewarded for not doing the work. Its called life. You have to have good grades to graduate from a US university. I think a C- is as low as you can go. You may have to take some classes over and get better grades so your cumulative average is at least a C. Good luck.