At my school, there was a student who would disrupt the class and just will not settle.  He was however able to answer any question that you asked him about what was being taught.  At times we did not know what to do.  But we did not leave it there.  We pooled our ideas, researched and came up with strategies that will assist him.  The teachers were patient and did not give up on him.  Although it was difficult at times, we continued to work with him and hope the impact was successful.