A grading system for all major and minor subjects shall be used by all schools in Tangipahoa determining the credit given for each unit using a letter grade assigned according to a four point scale as follows:     

  

A – 4 points   90– 100%    

B – 3 points   80 – 89%  

C – 2 points   70 – 79%  

D – 1 points   60 – 69%

F – 0 points      0 – 59%