First and also the most important one is parents think this is the way changing kids' future. Well-educated parents realized that Chinese education system emphasizes a lot on memorization and testing. They know this is not good for their kids from their own life experiences. They also understand how important to become an international person. They think the best education system is in North America, so they have to send their kids abroad. They think that foreign education system is perfect, and the flexibility can develop the child's active thinking, language ability... a lots of advantages. They want their children to accept new system in early age, and expect this can expand their view of the world which is a good foundation of their lives. The idea is good.
Also, Chinese family education is usually very traditional. Parents do not let children do anything except studying, but they know this is not good for the kids. As a result, if they let kids studying abroad, kids will learn how to handle their own life. They have to schedule studying, grocery shopping, cooking...... as well as deal with living with others, solving problems. However, not all the kids will follow the way their parents expected because they can not grow up in one night. It takes time to change. Some kids become independent and focus on studying, while as some just playing and missing classes. They become even worse then they were in China. Yet, parents' wish is always good.
Moreover, they also think that the earlier children to go abroad, the earlier they used to foreign environment. In parents' mind, they think that in North American people make more money and the life is better. From this judgement, they want their children can stay there after they finish education and have better life.
Furthermore, there are some parents are super rich and some parents have super power. For all sorts of reasons, they have send their children to go abroad. This is absolutely not a few. Many Chinese government officials transfer their property abroad. They purchase a house or more than one, and send their spouses and children to travel abroad. They applied for a PR card and even foreign nationality. This is not a secret in Canada and United States. Those money are absolutely from corruption. Transfer money to another country is a safe way. However, as this is not a secret, Chinese government already started investigating senior officials if they got by citizens. It is in a positive progress, yet, it does need time.
I have noticed that lots of information about China are not good, especially on Facebook and Youtube those kind of media. However, you cannot judge a country without visiting or living there. China has its lovely aspect and it is growing in a positive way.