What were the main changes made by the Bihar Land Reforms (Amendment) Act, 1953?
The main changes made by the Bihar Land Reforms (Amendment) Act, 1953 were:

1. It introduced a new concept of "holding" in place of the old concept of "right". This was done to simplify the land revenue system and make it more efficient.
2. It provided for the assessment of land on the basis of its actual productivity, rather than on the traditional system of fixed rates or ratios.
3. It abolished the old system of levying land revenue through the intermediaries like zamindars and talukdars, and instead vested the power to collect land revenue directly with the government.
4. It provided for the distribution of surplus land among the landless and poor farmers, in order to promote agricultural development and reduce poverty.