i think that the us is way more relaxed on the school system then the other countries are like russia the Russia school system way different than the us system because of they way the classes are separated out like in the us the 1-6 graders are all elementary and the the 7-8 are junior high and then the 9-12 are high school. in Russia education for kindergarten is optional for 3 to 5 year old's. Russia also has primary school that starts around 6 or 7 years old and last four years so when there done with that they will be 9 years old. and then once they turn 10 they will go to basic education that will last 5 years then after that 5 years is over their knowledge will determine where they go after that.