How can i become part of the Secret Service?

Question

what do have too study.

Answer 1

Study anything you want, but they give strong preference to previous experience in law enforcement or military. And, you should make sure there's nothing in your background that would prevent you from getting the highest security clearances.

Answer 2

Just ask them. Secret Service is always looking for good people. Just remember, it isn't at all like in the movies. It is a very demanding law enforcement job, with long hours of boredom. True law enforcement people pray they will never have to use all the skills they have acquired.
Very best wishes to you.