| Factors or features | Description | References |
| (CGPA) | Cumulative grade point average | [11, 13–17] |
| Internal assessment | Students’ behavior in the class such as exams marks, lab tests, class tests, attendance, and discussions | [5, 11, 12, 13, 18] |
| Students’ demographic | Students’ characteristics that include gender, age, salary income, and family background | [14, 19–22] |
| External assessments | Factors coming from student’s environment: student’s behavior out of the class such as extracurricular activities, high school background, social interaction network, and psychometric | [13, 17, 23–26] |
| Extracurricular activities | Activities which are not essential for normal class activities | [11, 13, 17, 27] | High school background | Preadmission courses for universities | [20–22] |
| Social interaction network | Interacting among students or instructors by using social networks | [12, 20, 24, 28] |
| Psychometric | These attributes can be collected after enrolment such as attitude, motivation, personality, and learning strategies | [27, 29, 30] |
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