Comparison and contrast

Lastly, it is unfair for students of diffrent abilities to get the same grade of "pass" of "fail". Anyone Would agree that it is unfair for a student  with "A" avrage and a student with "C"avrage to  walk out of a class with the same grade . The "A" student  has achieved  much more in the class than the "C" student and therefore , should not be treated the same as the "C" student. Don't employers promote and give  raises to their employees who do the best job for the company? Would they reward the employee who does little work, comes late ,or takes too many days off? Of course not . Then, whay do we even consider students , equally for diffrent levels of achievment?I think rewards should match the  achievement.