Recent 'landmark judgments' retrospectives trace one continuous constitutional thread from the Berubari Union case and the 1967 Golaknath judgment, through the 1973 Kesavananda Bharati case, to the EWS reservation judgment — all concerning the limits of Parliament's power to amend the Constitution under Article 368.
The core question was whether a constitutional amendment counts as 'law' under Article 13(2), which voids laws abridging Part III rights. Golaknath said yes, barring Parliament from touching fundamental rights at all; Parliament's 24th Amendment reversed this via changes to Articles 13 and 368; Kesavananda Bharati's 13-judge bench then held Parliament can amend any part, including fundamental rights, but not damage the Constitution's 'basic structure' — features like judicial review (Articles 32, 226), rule of law, separation of powers, federalism and secularism. Articles 31B and 31C, used to shield laws from fundamental-rights scrutiny, became key battlegrounds for testing this doctrine, later applied to the EWS amendment.
For exams: remember the sequence — Berubari, Golaknath (1967, absolute bar), 24th Amendment, Kesavananda Bharati (1973, basic structure doctrine), and its later application in EWS — plus the key articles: 13, 14, 15, 16, 19, 21, 31B, 31C, 32, 226 and 368.