Exactly he is going to that type of school, we do have some different reports and we also can get report from doctors if we need it? Should I do his medical examination from canadian authorize doctor and see what they say?
As discussed earlier, your brother has slim to zero chances of a TRV approval. That said, you can reapply but please don't get your hopes too high. If your brother is approved then it would be great else there's nothing more that you can do.
My first bit of advice:
Don't reapply immediately. If your dad's business requires him to remain in India through the winter then you could plan to reapply next February-March.
Second bit of advice: You may want to consider one or more of the suggestions which I had given in a previous post on this thread.
When your brother reapplies:
1. IMO, he'll need to provide 'out-of-the-box'/untypical/non-standard type of documents to prove that he is not physically challenged, will not put excessive demand on health or social services, not dependent on anyone beyond reasonable limits, does not require medicines, etc.
2. He'll need to prove he must return for his examinations + he must return because your parent(s) must return
3. He must include medical reports (regular ones + mental evaluation), progress reports, a doctor's certificate, private medical insurance, etc