
I feel this way. My daughter is in 1st grade and she has been well ahead of normal all year and her teacher has to be dragged to accommodate her with slightly more advanced materials. It took her 6 weeks to allow my daughter to take the final sight word vocab tests for the grade level. My DD could have been studying the 2nd grade words but was held back to stay at pace with the rest of the class.
This doesn't allow a child to excel in school - it guarantees that they will stagnate and become mediocre.