pebbles

Hello, I am planning to apply for Ms biotechnology for fall 2012.I have completed my masters in Life Science from India. I have a GRE score of 1280 . I like the course offered at U Penn , Carnegie Mellon and North eastern. Could you guys give me some idea of the credentials required to get an admit into the program and as to how can I make my application stronger( Research experience or a job in a phrama ).