Hello, Hope you are doing well. I guess you are talking about the post Tahsildar. In India, Pakistan and Bangladesh tehsildar are also known as tax or revenue inspector. To become a Tehsildar in India a candidate must have graduation degree from a recognized university with an age limit of 18-30 years. Every year a state wise vacancy is announced by the respective authority in order to give the bright future to the candidates. The recruitment in this post is on the basis of an entrance examination. This examination consists of two paper in which paper 1 carries 150 questions which covers the areas like mathematics, science, general English and reasoning, and paper 2 carries 150 questions of polity, economics, history, Indian Constitution, current affairs, etc. The duration of this exam is 2 hours. 

For the preparation of this exam, a candidate must do a strategic study. Prepare a time table and cover all the topic of the given syllabus. Do not attempt guesswork in the examination hall which leads you to negative marking and score low in the examination. Buy a topic wise book and try to solve as many questions you can solve. 

Hope this will helps you

Good Luck