I would like to help you with your question.
From what you posted, it sounds like your grandson is a curious and active youngster. I understand your concerns about his readiness for pre-primary and whether he will be able to adjust to this environment.
Can you tell me a bit more about his destructive behavior? And...why do people not like him? Is it because he is so active and not a calm, quiet child?
I would be very happy to chat with you more about your grandson.