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 where it is a State ***, after consultation with the Governor *** thereof,] by public notification, specify the tribes or tribal communities or parts of or groups within tribes or tribal communities which shall for the purposes of this Constitution be deemed to be Scheduled Tribes in relation to that State or Union territory, as the case may be.

(2) Parliament may by law include in or exclude from the list of Scheduled Tribes specified in a notification issued under clause (1) any tribe or tribal community or part of or group within any tribe or tribal community, but save as aforesaid a notification issued under the said clause shall not be varied by any subsequent notification.

['''342A. Socially and educationally backward classes.'''— (1) The President may with respect to any State or Union territory, and where it is a State, after consultation with the Governor thereof, by public notification, specify the socially and educationally backward classes which shall for the purposes of this Constitution be deemed to be socially and educationally backward classes in relation to that State or Union territory, as the case may be.

(2) Parliament may by law include in or exclude from the Central List of socially and educationally backward classes specified in a notification issued under clause (1) any socially and educationally backward class, but save as aforesaid a notification issued under the said clause shall not be varied by any subsequent notification.]  

343. Official language of the Union.—(1) The official language of the Union shall be Hindi in Devanagari script.

The form of numerals to be used for the official purposes of the Union shall be the international form of Indian numerals.

(2) Notwithstanding anything in clause (1), for a period of fifteen years from the commencement of this Constitution, the English language shall continue to be used for all the official purposes of the Union for which it was being used immediately before such commencement:

Provided that the President may, during the said period, by order authorise the use of the Hindi language in addition to the English language and of the Devanagari form of numerals in addition to the international form of Indian numerals for any of the official purposes of the Union.

(3) Notwithstanding anything in this article, Parliament may by law provide for the use, after the said period of fifteen years, of—
 * (a) the English language, or
 * (b) the Devanagari form of numerals,

for such purposes as may be specified in the law.

344. Commission and Committee of Parliament on official language.—(1) The President shall, at the expiration of five years from the commencement of this Constitution and thereafter at the expiration of