There have been some important changes in the population of my country in the last 20 years. For example is population in Thailand . Thai people in cities,the rest in the country side. But for years now,due to the difficult economical situation ,more and more people from rural areas more into the cities,mainly to Bangkok,which meanwhile belongs to the most populous cities in the world . The average life expectancy of a Thai is just under 70years,whereby women become almost 8 years older. Some positive results of these changes include education and school system in Thailand . During the past conturies the degree take an entrance examin Thailand compared with previous generations is due to the growing amount of students heavily grown.