Don't worry Phillis. The uni website pages you will enter marks on are 'auto spreadsheets' (though of course, it's all in Chinese). You set the percentage of the final grade in each of four categories/columns: 1 Attendance/Class Participation, 2 Laboratory, 3 Midterm Exam, 4 Final Exam.
You won't be teaching any courses with lab sections, and unless you're masochistic and incredibly stupid, you won't be giving midterm exams... so, you'll enter two marks for each student, hit the 'Save' button and the computer will calculate the Final Grade.
I'll explain the grading system to you... and what 'failure' with marks from: 0-29% and from 30-59% mean. 60% is minimum 'pass'. If you fail a student, they are punished by delaying their 'pass'... the real duds, until 'gifts' are given by their fathers to the administration - just before they graduate.