Oppositional Defiance Disorder aggressive behaviour

First of all, you need to follow the pattern of the child, like when he gets angry, what triggers him, etc.

Then you have to be very clear about the rules and consequences to the child that going to apply. Inform the child very firmly about the rules.

Exercise hostility away from the child. Treat him patiently.

Practice some good manners activities like greeting in the morning, bidding goodbye, and saying “thank you” regularly.

Stay positive and be Consistent with Disciplinary Strategies.

Celebrate the child's accomplishments in front of others. That will motivate the child.

I know it is a tough job and that is why you have to keep patience as every child is different and takes a different time frame to reciprocate. Slowly and gradually with your help, the child will be pacified and definitely will learn the disciplinary acts.

Thanks

Nandita