how much percentage of marks is equal to 2.1 grade?

Answer 1

That depends on the grading system and how many classes you are taking. If A = 4, B = 3, C = 2 etc. If you got all C's you would have a 2.0 average. To get higher than 2.0 you would need one grade higher than a C. Also if you got one D, you would need one B to offset it.