<s>[INST] What are the changes brought about by the Constitution (First Amendment) Act, 1951, s. 13 in terms of office tenure for the person who was Auditor-General immediately before the commencement of this Constitution? [/INST] The changes brought about by the Constitution (First Amendment) Act, 1951, s. 13 in terms of office tenure for the person who was Auditor-General immediately before the commencement of this Constitution is that they would become the Comptroller and Auditor-General of India and continue to hold office until the expiration of their term of office as determined under the provisions which were applicable to them immediately before such commencement. </s>