Important Amendments to Indian Constitution.

Amendment Year Importance
71956Reorganisation of states on linguistic basis and abolition of Class A, B, C and D states and introduction of Union Territories.
91960Adjustments to Indian territory as a result of agreement with Paksitan.
101961Dadra, Nagar and Haveli included in Indian Union as a Union Territory on acquisition from Portugal.
121961Goa, Daman and Diu included in Indian Union as a Union Territory on acquisition from Portugal.
131963The state of Nagaland formed with special protection under Article 371A.
141962Pondicherry incorporated into Indian Union after transfer by France.
211967Sindhi added as language in the 8th schedule.
261971Privy purse paid to former rulers of princely states abolished.
361975Sikim included as an Indian state.
421976Fundamental Duties prescribed, India became Socialist Secular Republic.
441978Right to Property deleted from the list of fundamental rights.
521985Defection to another party after election made illegal.
611989Voting age reduced from 21 to 18.
711992Konkani, Manipuri and Nepali added as languages in the Eighth Schedule.
731993Introduction of Panchayati Raj, addition of Part IX to the Constitution.
741993Introduction of Nagarpalikas and Municipalities.
862002Free and compulsory education to children between 6 and 14 years.
922003Bodo, Dogri, Santhali and Maithli added to the list of recognised languages. Service Tax introduced.
8,23,45,62, 79 and 951960, 1970, 1980, 1989, 2000 and 2010Extension of reservation of seats for SC/ST and nomination of Anglo-Indian members in Parliament and State Assemblies.
962011Substituted Odia for Oriya in the Eighth Schedule to the Constitution
972012Introduction of Part IXB in the Constitution pertaining to Co-operative Societies
1012016Introduction of Goods and Services Tax (GST)
The 42nd amendment was the most comprehensive amendment which had 59 clauses and carried out so many changes that it has been described as a "Mini Constitution".
The 52nd amendment was the only amendment to be unanimously adopted by the Parliament.