Why is a spectre of empty classrooms looming? | Explained

What has the Supreme Court ruled on the Teachers’ Eligibility Test? How many teachers are likely to be affected? Why has Tamil Nadu sought a review? What does Article 21A lay down? What is the situation in other States? Are minority institutions part of the verdict?

​What has the Supreme Court ruled on the Teachers’ Eligibility Test? How many teachers are likely to be affected? Why has Tamil Nadu sought a review? What does Article 21A lay down? What is the situation in other States? Are minority institutions part of the verdict?