Economix presents two graphs which say it all - the reasons, implications and the likely trend in the future are discussed in the article.
Could this be happening in India at the Class XII level? Are the larger number of students with high scores that we are seeing today due to easier questions on the test, more liberal grading, or are today's students actually doing much better than their past cohorts?
It would be interesting to if someone has analysed the data from Class XII board exams for CBSE and some of the state boards. If not, it may be time someone did.