"The Android Developer Challenge is open to individuals, teams of individuals, and business entities. While we seek to make the Challenge open worldwide, we cannot open the Challenge to residents of Cuba, Iran, Syria, North Korea, Sudan, and Myanmar (Burma) because of U.S. laws. In addition, the Challenge is not open to residents of Italy or Quebec because of local restrictions."

According to this I guess international students must be eligible to participate. But if you belong to one of the countries mentioned in