At my DD's school it seemed that when she was accelerated in anything that was up to 6th grade the grades was as though she was in that grade. So as a 4th grader in a 6th grade math class she was graded the same as the 6th graders. Once she moved out of the 6th grade curriculum into middle and high school levels the grading seemed to ease up a bit. I think partly there were few kids who they were able to compare her to. The teachers were elementary teachers not middle/high school teachers. However, as far as state tests were concerned she was always tested at her grade level and scored in the advanced range.