Availing a full scholarship is next to impossible. That's the harsh truth. At best, you willget 50-70% fee wiaver, that too if you have great academic achivements along with a well-formed profile and personality.

Like said in the other answer, GRE and TOEFL are just exams that are mandatory, but do not guarantee your admission. Having a good score is very beneficial, but to get an admit, and that too with a scholarship you must have a great profile with tremendous academic record(not necessarily) along with a co-curricular and extra-curricular activities and humanitarian work.