query for r13 grace marks

in internal marks are 20 and External 13,20 is internal and external 10 and 24 in internal and external 10marks ?what i can do grace or drop
 
In 2-mathematics 24 in internal and 10 in best of all year ...
Where as 4-2 presstresses concrete 20 in i eternal and 13 in external
Rehabilitation subject 20 marks in internal and 10 marks in external
 
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