are you talking about the final hsc exam? if so, the total marks for the mx1 exam depend on whether you are taking it as two units alongside mx2 or as a single unit wif two units wif advanced maths, otherwise known as the 2 unit course. if u are taking mx2, the mx1 exam, being 2 units of study, would be marked from 100. however, if u are taking mx1 alongside 2 unit maths, in the case where it only accounts for a single unit, the final exam would be from 50.