What do i need to get on my maths exam?

i've been doing modular exams since year 10, and have done m7, m8, m9 and im doing m10 this tuesday. i got C,C,B in those last exams. the other week we had to do a terminal, like just a higher maths exam, which i don't think i did too good on. what percentage of the overall terminal exam would you say i'd needed to have got to atleast get a C? thank you!