276. Subject to the provisions of the Constitution the Public Service Commission of the Federation or a Unit shall
(a) Conduct examinations for appointments to Civil Services of the Federation and those of the Units and Sub-Units respectively;
(b) advise the Government on any matter referred to them under Clause (277) or any other matter which the President of the Federation or the Head of the Unit or Sub-Unit, as the case may be, may refer to them;
(c) discharge such other functions as may be provided for by a Law by the appropriate Legislature.