Please read the various topics about the stage of implementation of Indian Constitution and try to understand the subject fully. What are the important features of Indian constitution? Justice, freedom, equality and fraternity to all citizens by its numerous provisions for their peaceful and dignified living in spite of the country's huge cultural, lingual, religious diversity.
You should also understand the Fundamental rights and directive principles mentioned in the Constitution. How far these points are implemented in its true spirit and how many of them are not implemented and why? You should make a note of this important factor.
Next, come Fundamental duties, How far each citizen of this country is abiding by this. This is to be properly understood. Then comes the role of central government. State governments and local bodies. How far they are following this constitution provisions in the discharging of their duties.
You should get a clarity on these issues. Then you can make a meaningful contribution to the debate. You should be able to talk extempore and you should not give a feeling and you have mugged up the subject and releasing there. Your voice should be clear and modulate in such a way that the people will have interest in listening to you.