Unit 1: Period 1: 1491–1607
4%–6% Weightage
Unit 2: Period 2: 1607–1754
6%–8% Weightage
Unit 3: Period 3: 1754–1800
10%–17% Weightage
Unit 4: Period 4: 1800–1848
10%–17% Weightage
Unit 5: Period 5: 1844–1877
N/A Weightage
Unit 6: Period 6: 1865–1898
N/A Weightage
Unit 7: Period 7: 1890–1945
N/A Weightage
Unit 8: Period 8: 1945–1980
N/A Weightage
Unit 9: Period 9: 1980–Present
N\A Weightage