As soon as may be after the commencement of this Act, the President shall by order make such modifications in the Constitution (Scheduled Castes) Order, 1950, the Constitution (Scheduled Castes) (Part C States) Order, 1951, the Constitution (Scheduled Tribes) Order, 1950 and the Constitution (Scheduled Tribes) (Part C States) Order, 1951, as he thinks fit having regard to the territorial changes and formation of new States under the provisions of Part II.