Mathematics for Economics I. GEMAN1013BA

Grading: 
If "Test_score" < 20, then FAILED, need to take a makeup test.
If "Test_score" > 19, then PASSED,
   % = Ceiling ( "Test_score" * (100/40) + 4 ).
   grade: 50-62: 2,  63-75: 3,  76-88: 4, 89-104: 5.