Half the 2012 IR paper was current affairs. Or rather war and diplomacy in the unipolar world.

For the Cold War, the two World Wars, the inter-war period, NAM, NATO-WARSAW, etc, I used Palmer and Perkins and Sultan Khan. The latter also covers most of the theoretical aspects of IR. But if you read different newsmagazines and follow the news regularly, the 'current affairs' part of the IR paper won't be too difficult for you.

Prakash Chandar is an informative book but it's full of grammatical errors.