mmm maybe more clarity I reckon! That's usually been said to me and I just focus on getting my points out there without much waffle :3
I wrote 11, 11.5 and 12 for my modules .. It depends on what your writing style is tbh.
if you're in year 12 its better to tell the teacher imo, cos you're basically denying your cohort (and you) higher marks but putting a smarter person at a lower rank i think