Reservation is one of the mechanisms of protective discrimination for eradicating the present institutionalized effects of past discriminations, through positive governmental steps awarding preferential treatment in favour of certain weaker sections of the society. Reservation is applied only in graded societies, where certain groups enjoyed more powers and privileges, while the other sections have been wholly or partially neglected. It involves encouragement sharing in favour of certain weaker sections of the society. It involves encouragement sharing of opportunities in the executive, legislative bodies, in educational institutions and in public services. Demand by the unprivileged classes to enjoy the same opportunities of the privileged class resulted in social conflict in the earlier stages. In course of time, the unprivileged section came to enjoy social, political and economic and other privileges on par with others. As per the Constitution of India, it is a temporary phenomenon used for some special achievement. In course of time, the unprivileged section came to enjoy social, political and economic and other privileges. Thus, everybody in the beneficiary categories Viz., Other Backward Classes in all India level, Backward Classes and Most Backward Classes in Tamil Nadu, Scheduled Castes and Scheduled Tribes did not enjoy the same status in the society. Due to the reservation policy, there are tremendous transformations in the social structure. It is evident that, there are noteworthy rich people among the backward and depressed castes. Similarly there are poor people in the forward castes as well. Not only that as per the Constitution of India, it is a temporary phenomenon used for some special achievement. In this research paper, an attempt has been made to examine and compare the concepts of exclusive reservation and creamy layer and to study the changing trends in the reservation policy towards social justice.