Elections
(1) The President, by public notification (consulting the Governor for a State), specifies which classes are deemed "socially and educationally backward classes" for that State/UT. (2) Parliament may by law add to or remove from the Central List of such classes, but no other authority can vary a notification once issued.
Added by the 102nd Amendment (2018), this mirrors Articles 341/342 for OBCs (Other Backward Classes) - giving this category the same formal, presidentially-notified, Parliament-controlled listing process as Scheduled Castes and Scheduled Tribes already had, reflecting OBC status's elevation to a more formal constitutional listing mechanism.
This is why the "Central List" of OBCs (relevant for central government reservation purposes) is created and can only be modified through this same formal notification-and-Parliament process, rather than by simple administrative decision.