Crack your International Relations (IR) portion with the most conceptual notes by Atish Mathur Sir - Comprehensive Consolidated Notes (CCN) 2.0 For IR. Published by AM - Cogito Ergo Sum, this is the most recommended booklet for UPSC CSE Mains PSIR Optional Paper 2 and GS Paper 2.If you are confused between many bulky books for IR, Atish Mathur Sir’s CCN 2.0 is the one-stop solution. It is not just a book, it is a consolidated summary of International Relations theories, India’s Foreign Policy, International Organizations, and current global dynamics written in a very simple, toppers-style format.This latest CCN 2.0 edition is fully updated as per UPSC 2026 trend covering topics like New World Order, India-US, India-China, Russia-Ukraine crisis, QUAD, I2U2, WTO reforms, and UN reforms. The notes include flowcharts, diagrams and answer-writing structure that helps you write high-scoring answers in Mains.Best for PSIR Optional students and also for GS-2 IR part. The content is written by Atish Mathur Sir himself who is known for his conceptual clarity in IR and PSIR.At Tirupati Book Centre, Karol Bagh Delhi, we provide 100% original Atish Mathur AM Institute notes. Get same day dispatch, 49/- Shipping across India. Don’t buy old CCN 1.0, buy latest CCN 2.0 for best preparation.