Understand the examination methods of Thai students in Han Dynasty.

The Imperial College of Han Dynasty did not stipulate the academic system, and the teaching focused on self-study, encouraging students to teach themselves and argue with each other. Doctors sometimes teach in lecture halls and are called "most professors". Imperial academy pays attention to exams. At first, he took them once a year, and those who passed were appointed to official positions. This is called "learning to choose". In the Eastern Han Dynasty, it was changed to a two-year exam. The method of examination is called strategy test, which is similar to today's lottery test. The examiner draws up a number of questions according to the meaning of the exam and divides them into two sections, A and B, for selection. What the examiner chooses to answer is called countermeasures; Candidates take questions and then answer them. This is called shooting strategy. Those who pass the exam are awarded different official positions according to sections A and B. Those who fail continue to study and take the exam next time. This examination method has the dual functions of selecting talents and urging students to study.