Celebrate their success! Make them peer tutors and have them help their classmates achieve the same kind of success. Advise student tutors that they can’t touch the mouse or give answers - they can only ask questions to help guide their peers to answers. Helping other students will engage them even more, and help them to learn more, too!
If your school is also using Carnegie Learning Algebra I, Geometry and Algebra II, students are able to begin the next course. Students can also redo any part of the course they want for extra practice by creating a new student file.