Question

why did nawabs of awadh and bengal tried to do away with the jagirdari system?

Answer 1

The Jagirdari System in Bengal and Awadh

Explanation:

The Nawabs of Bengal wanted to have full control over the revenue  department

The Nawabs wanted to abolish the emperor's appointed Jagirdars to put an end to the influence of the Mughals.

The Jagirdars appointed by the Mughals were corrupted and so, as to stop corruption the Nawabs tried to abolish Jagirdari system.