The Central Board of Secondary Education conduct Class X and Class XII exam every year across world.Class 10th grading system are A1, A2, B1, B2, C1, C2, D, E1 and E2. The 9-point scale will start from A1 (with 91-100 marks, exceptional); A2 (81-90 marks, excellent); B1 (71-80 marks, very good); B2 (61-70 marks, good); C1 (51-60 marks, fair); C2 (41-50 marks, average); D (33-40 marks, below average); E1 (21-32 marks, needs improvement); and E2 (00-20 marks, unsatisfactory).