No, there is no need to do anything dishonest or unethical. The board asks that the moderator sees your top and bottom marks; they do not ask to see any marks in the mid-range; in my view they should ask for a sample that reflects the whole mark range but it is isn't a requirement. It is in the mid-range where the grade C boundary lies and the teacher's marking is not assessed for this range. The board allows a mark difference between the teacher and the moderator of plus or minus 2. If you know where the grade C boundary is it makes no sense to give a candidate a mark which is just below the grade boundary it is better to award a mark that is just above it: and still be within the tolerance of +/-2. It goes without saying that your marking should be as accurate as possible. The same goes for all grade boundaries including A*. Remember if you do, say, 5 pieces of coursework, your A* candidate does not have to achieve their best mark at the moderation; they could have achieved their best mark in performance 4 ie the candidate scores maximum marks for piece 4 but slightly under maximum for piece 5 (the moderated piece); the marks for piece 4 are the ones that go forward if the moderator accepts the standard of the teacher's marking. You can't cheat because the moderator should look at all your marks and make a judgement about whether or not your A* candidate could really have got the slightly higher marks for piece 4. But what you can do is to ensure that your A* candidates get the A* for coursework they deserve and not an A.