Confused about the results. help please

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Hello I checked my results on the website and it says

75% B maths
68% C physics
58% D Biology

are the results on the website based on the marks after grading scheme put in like as in last years it was usually 80-90/130 for AS to get A.. that is around 65% total mark.. so how is it graded and will it be calculated differently in the certificate
 
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