cmdrsk;569349I am personally mot aware of anyone who moved with kids in higher grades. All I know are people with kids in grades 6 or lower. I am speaking of people who lived in US for 10+ years.
I myself moved when my kid was going to 3rd grade. Third year in chennai still my Kids talks about wanting to return to US.
My kids started 9th & 7th back in 2011 summer @ Vaels (Chennai). The move was planned for 2011 since both kids needed to change schools in California (to High school & middle school), so a "minor" change was anyway happening. Plenty of kids with similar background, so it was easier on them. I wouldn't say that they were thrilled re-locating to India (the usual challenges that American born kids face in Chennai - weather, ... - & then there is the teenage blast sweeping through), but still adjusted quiet well (couple of pets helped :-), along with finding a good set of friends - so selecting the right school is important !!). BUT they do want to get back to USA for college - which I have promised them, if they get into a "good" university in USA (not considering the Ivys, Stanford, etc as that would be an unfair carrot to hold out). Elder one is completing 12th (A-level - Cambridge) and has applied to couple of universities in USA - early action application.