Hey Hi5,
-treatment of him by her ( constant singling out for punishment /ridicule )
Oh my gosh yes, it is absolutly possible to railroad a child into poor performance!!! You know the saying that even bad attention is better than no attention? Same principal. Your child is being treated as a lesser student than the elder siblings and his self esteem could be damaged. The teacher is ignoring his abilities and why would he put himself out there, if he has tried before and just gotten a bad response.
You may seek out having him tested privately. That is the path I took with my DD.
What a sad situation. Best of luck!
