It is an application of classroom evaluation. Students use tablet computers to interact with teachers in class. Teachers initiate classroom test exercises, and students answer them on tablet computers. Teachers can always see the progress of students' answers, and the system will directly grade the objective questions. After the subjective questions are uploaded, the teacher will correct them online. Students' learning portraits can be obtained in the classroom, which is convenient for teachers to give students personalized and accurate counseling. In addition, teachers are supported to interact with students through tablet computers to realize flipping the classroom.