It is beneficial for high school students to study abroad.

Point 1: Improve your language skills.
Point 2 : Get a chance to explore the culture.
Point 3 : Step out of your comfort zone.

Proof 1: There was a research that said for example if a person is surrounded by English speakers, the effectiveness of learning English will be faster than if you just stay in your own country, especially not a english speaking country.
Analysis 1: You might succeed in learning the language by yourself or in the classroom, but it will be better and faster if you go abroad and be in that environment.

Proof 2: for example, they have tips in western culture, but not in asian culture.
Analysis 2: You can not experience the culture unless you are in that culture environment.

Proof 3: You will be more independent if you put yourself in a new environment. You will face some difficulties or try new things.
Analysis 3: Except the professional skills and learning other cultures, you might get affected by the new environment, so that you can try new things, and also get to know yourself more.

Concluding Sentence: There are so many benefits of studying abroad.