Standard textbooks (like NCERT) are excellent for theory but often lack the structured presentation required for last-minute revision or concept clarity. Chatterjee’s notes bridge that gap. His PDF notes are legendary for:
Amit Chatterjee’s works are available digitally via Amazon Kindle and Google Play Books. While not "free," a digital copy costs roughly 60-70% of the physical book price. You can then export highlights and create your own custom PDF. Amit Chatterjee Economics Notes Pdf