Here let me educate you on the history of British India:
Presidencies and provinces of British India - Wikipedia, the free encyclopedia
After Robert Clive's victory in the Battle of Plassey in 1757, the puppet government of a new Nawab of Bengal, was maintained by the East India Company.[12] However, after the invasion of Bengal by the Nawab of Oudh in 1764 and his subsequent defeat in the Battle of Buxar, the Company obtained the Diwani of Bengal, which included the right to administer and collect land-revenue (land tax) in Bengal, the region of present-day Bangladesh, West Bengal and Bihar.[12] In 1772, the Company also obtained the Nizāmat of Bengal (the "exercise of criminal jurisdiction") and thereby full sovereignty of the expanded Bengal Presidency.[12] During the period, 1773 to 1785, very little changed; the only exceptions were the addition of the dominions of the Raja of Banares to the western boundary of the Bengal Presidency, and the addition of Salsette Island to the Bombay Presidency.[13]
Portions of the Kingdom of Mysore were annexed to the Madras Presidency after the Third Anglo-Mysore War ended in 1792. Next, in 1799, after the defeat of Tipu Sultan in the Fourth Anglo-Mysore War more of his territory was annexed to the Madras Presidency.[13] In 1801, Carnatic, which had been under the suzerainty of the Company, began to be directly administered by it as a part of the Madras Presidency.[14]