Exam systems

Postgraduate exams are held twice each year, the first time is at the end of the academic year, and the second time is at the beginning of the next academic year. The exams shall be written and oral in all subjects. Failure in the written exam in any subject, the student is prohibited from applying for oral exam. The success estimates are as follows:
Excellent is from 90% or more of total grades
Very good is from 85% to less than 90% of all grades
Good is from 75% to less than 85% of all grades
Anyone who gets less than 70% is flunking