The laws of a country play an important role in bringing about reforms. But, laws alone cannot resolve challenges, democratic reforms are to be carried out mainly by political activists, parties, movements and politically conscious citizens.
The greatest challenge that India faces is of corruption. Corruption is rampant in all government departments and the few clean politicians are lost in the multitude of corrupt politicians.
Part from that, people are divided on the basis of caste and religion. You cannot have reforms implemented unless people and politicians overcome the barriers of caste and religion.