Say your child's teacher determined that they were capable of skipping past their next grade level, and could instead go into the one after that. Your child, however, didn't want to go into an unfamiliar classroom where he knew no one and had no friends. Would you allow him to continue on in his correct grade level, or insist that he make the leap?
On the flip side, if you saw that your child was struggling in his current grade level, and teachers recommended that he be held back, but he didn't want to; would you have him repeat the grade or allow him to advance?