University of Hyderabad Grading System

Provide method that how I can convert my marks into Grades? I am doing M.Com Degree from the University of Hyderabad. From this year the University of Hyderabad will give Grades to all students. There is no marks and no percentages. So pls provide me method to convert my marks of first semester into Grades. Give me phone number of exam controller of University of Hyderabad to get correct information.