Revolutions, industrialisation, empire and the two wars — read comparatively rather than country by country.
The Enlightenment and the American and French revolutions, the Industrial Revolution, nineteenth-century nationalism and imperialism, the world wars, decolonisation and the Cold War.
Comparatively. The same forces — industrial capacity, nationalism, imperial competition — produce very different outcomes in different places, and the interesting question is almost always why the divergence happened.
Colonial India is a case study inside world history, not separate from it. Reading the two together makes both clearer than reading either alone.