Does it sound right?

To add to that, if you wanted to specifically ask for "A", you would say "What letter grade did you get?"

Marks and grades are the same thing. Everybody knows this. Being marked off or marked wrong is a completely different usage of the word "mark".

>>Marks and grades are the same thing.<<

Obviously not to that Californian.

"Obviously not to that Californian."

I am that person, and I believe I am the one who said they are the same thing. "Mark" is not used where I live, though. The one I was arguing with claimed they were different.

Looking back, I think I see where you may have gotten confused. The "Guest" who said they are different was not the same "Guest" as me.

Some countries use a 100 or 150 mark system , not ABCD or percentage.

How many times do I have to tell you that we call that a grade as well?

I know you do.
I just want to say that in some countries those are two different things and have different names which English can't describe.

I wouldn't say English can't describe the differences.

A,B,C,D,F = letter grade
89% = percentage
120/150 = score

all of the above = grade

Well score is the right word.
But I still don't think grade is the most appropriate word, non-native speakers could be confused.

So the term "mark" is not used by the 3M at all? In other countries, a teacher would allocate marks out of a possible 10, 20, or 100 for that element of the exam or assignment, then grade the results into blocks, or bands if you like, so that say the top 10% get graded A, the next 15% are graded B and so on. The "grade" is a band; the actual mark can vary within the limits of that band.

Surely even 3M teachers/tutors/lecturers must go through a similar process in order to "grade" results. Fourteen out of twenty isn't a grade: it's a fraction, which equates to 70%, so the person who got those 14 somethings has just scraped into the grade of B - or just missed, if the quota for that subject required 15 somethings or 75% in order to get graded B.

If they insist on eschewing the term mark - which after all simply comes from the process of making some sort of a mark against an answer during the process of "correcting" or perusing a paper - there must be some other term used instead by those of the 3M who teach.

Or else everyone who gets an A comes equal first...

I'm afraid I don't know what "3M" is. Anyway, I assure you that we do not use the word "mark". We sometimes call grading a test "scoring a test" if it's on a scantron, though, if that's what you mean.