Some minorities are allowed to use their own language. I have been to a large city were many signs were written with Arabic characters.
In China, highschool is divided into junior secondary school and senior secondary school, both being three years. Only junior secondary school is compulsory. So, not all Chinese do attend highschool in the sense that they attend both junior and senior secondary school. In 2010 the percentage was 82.5. One should note that these percentages have increased strongly in the past two decades. To enter most higher education institutions it is not sufficient to finish senior secondary school, but one has to pass a state exam as well. I am aware that Chinese are obesessed with education, but it is also a fact that many Chinese still live in rural areas, where the quality of education is not always very high.
Spoiler alert for the movie Interstellar
It seems he did not get the main idea of the movie. The whole movie rests on the idea that it is possible to manipulate gravity in the past. The traversable wormhole was created by some humans in the far future and allowed the main character to communicate with the past, causing himself to join a space program, which would lead him to the place to communicate with the past, and by this save human kind from some disaster and in the far future allow to develop the technology to create the wormhole and a black hole with strange properties. So, it also involves a form of bootstrapping. Which makes even less sense, if indead traversable wormholes could be made at all.
The person giving me the assignment also wrote programs in some kind of simulation language where the lines could be in any order. Sometimes he would shuffle the cards while standing in line for the cards to be read, just to make fun of the other waiting.