What methods did the British East India Company use to conquer so much of India?

are u talking about the tea company?

if so - - the tea company was 'dying' and was left with a lot of tea so the british sold it directly to the colonists and forbid other local sellers to sell tea.

it has nothing to do with india

British East India company uses Tea company to conquer so much of India.

Explanation:

British East India company made the use of the tea company in terms of conquering the India. Tea company was on the whole dying and it was left with much of the tea in terms of selling the British directly to the colonists. They often stop rest of the local sellers to sea tea to India.