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I would recommend the nonprofit management concentration at University of Maryland University College (Master of Science in Management).
I would also recommend volunteering at some nonprofits in your area of interest to get hands on experience with how they work. There are several youth-focused nonprofits that you could learn from. You may want to volunteer to be on the board, help out with a committee, or interview some of the people involved with the organizations to get an idea of what they do.