Accurate. Cloud traces of big data can see the student examination paper analysis, is through big data, artificial intelligence technology to realize the normalization of the collection of teaching data, analysis, to realize the accurate teaching, so that the platform said that the child's grades are only one wrong question per door is accurate. Cloud traces of big data check results app is a new type of rapid marking mode, aimed at not changing the teacher's habits of marking under the premise of combining high-speed scanners and image recognition processing technology, to achieve the objective questions automatically say, subjective questions manually read (the system recognizes the score), the purpose of rapid marking of the automatic score.