At 18, Emily Johnson is a violin major at an arts high school but aced an Advanced Placement test in physics. A competitive swimmer, she started a program that is helping hundreds of children learn to swim. She has her choice of Harvard University or the University of Georgia’s Foundation Fellowship program, among other options.Johnson, a senior at the Savannah Arts Academy, came to a banquet on the Georgia Southern University campus Wednesday as Chatham County’s STAR student and left as Georgia’s Region 8 STAR. The Exchange Club of Statesboro hosted the regional event at the GSU College of Engineering and Information Technology honoring STAR students and teachers from 15 school districts.“Like every teacher in this room, we’re here with one student who represents a lot of talented kids that we deal with every day,” said Amy Durden, the Savannah Arts Academy physics teacher Johnson chose as her STAR teacher.