It is: 86%
d
43% or F
33 grade, 43 grade and the 53 grade cement (In India)
33 grade, 43 grade and the 53 grade cement (In India)
72
93% or A
86% or a B.
43
81.1% or B-
Yes. OPC 43 grade cement can be used to make M20 grade concrete.It can be used to make concrete up to M30 Grade.See related link.
If you missed 12, then you got 31 correct [43-12=31]. If all questions are weighted equally, then 31/43 = 0.721 or 72.1 %, so your grade is 72.