If your uncle's information is not very closed, you can ask their opinions and learn what major is better for employment. After all, you are still young and have no concept. In China, it is much better to have the opinions of elders combined with your own situation than to choose blindly.
As for the help of going abroad itself, I can only say that it is minimal. At most, there are elders who can take care of you after you come out, so that your parents can rest assured. But Hawaii is so far away that it really won't help if you don't go.
It is generally believed that college entrance examination and going abroad cannot be prepared at the same time. This is the experience of countless predecessors. It is strongly recommended that you give up the college entrance examination if you choose to go abroad. After all, few people can prepare for the American college entrance examination and the Chinese college entrance examination at the same time and both of them do well. Taking both into account is often not worth the candle.
Finally, if you apply for admission notice in the future, you must not tell the visa officer that you have relatives there when you apply for a visa. This is a very serious immigration tendency, and as long as they don't mention you when they go out, you don't rely on their real estate license when you go out again. The embassy can't know that you are related. Besides, your uncle has a green card and is definitely not a citizen. Since he went out with a visa in those years, he is obviously taking the road of immigration now, which means that it is a lie to say that he will return to China when he applied for a visa in those years. This dishonest record will make the visa officer suspect that you are the same, and then you will be miserable. . .
Since high school is only three years old, you'd better listen to the lecture about going abroad as soon as possible, or your parents can learn about it. If time is delayed, it will be in trouble. After all, the TOEFL quota is very tight every year, so you may not be able to get in. And going to Hong Kong to take the SAT is only a few times a year, so it's easy to miss it.