Next stop, high school. Victoria Grempei of Wantagh catches the 6:13 a.m. train to Penn Station every weekday. Nicholas Vernice of Garden City is also up bright and early, and treks to Manhattan on the 6:41 train. What's so unusual about that? They're in high school, and they go to class in the city, like more than 100 other Long Island kids who bypass Long Island's mass of schools to hit the books in the city that never sleeps. We follow them, from start to finish, on a very long school day.