I transferred both of my boys from private to public in Mansfield. One was in first grade (many years ago), and one was in kindergarten (this year). Our experience was good the first time, however our son was much more advanced than the other students in public school. Once he got to middle school and was able to take pre-AP classes he was a bit more challenged, but classes are still easy for him. My youngest is also way ahead in kindergarten. I wish I had left him in private school at least another year or so. The elementary is exemplary, but that rating is based on TAKS scores, and the TAKS test is a basic skills test. I teach AP English, and expect more than basic skills from my children. I don't put too much faith in the TAKS ratings. MISD is a good district, but so much depends on which teacher you get, in public or private schools. If I were you, I would visit the school. Ask to visit a 1st grade classroom so that you can compare what they are doing now to what your son is doing now in private school. Get a feel for the school. Then you can make a more informed decision. Good luck. It is such an important decision, but such a difficult decision to make.