DD did a full grade acceleration from K to 1 in late Nov. of the school year and luckily it went Ok. I don't think the 1st grade teacher told her class that DD was coming from K. She also talked with them extensively about DD coming and what they could do to make her feel welcome. She assigned two "helpers" to DD. The K kids seemed to have a harder time with it. They were upset about her leaving and couldn't understand why she got to leave and they didn't. They all claimed they were "advanced". I don't think the K teacher handled it quite as well. Usually there is an adjustment period and things might be rough for a few days. Hopefully it will improve for him.