Which Amendment to the Constitution inserted a new Article 21 A in the Constitution providing Right to Education?

Which Constitution Amendment Act reduced the voting age from 21 years to 18 years?

Which Amendment Act added a new Part IX-B in the constitution which is entitled as “The Co-operative Societies”?

Which Constitutional Amendment Act has added new provisions related to cooperative societies in fundamental rights and DPSPs of the Constitution of India?

Amendment of the Constitution is done with Article ______ of part XX

Which of these Amendment Act had not added a schedule in our Constitution?