What does the third grade of secondary school education mean for American immigrants?

The three meanings of immigrants in the United States are professionals, skilled workers and unskilled workers. According to relevant information, U.S. employment-based immigration refers to a U.S. company or U.S. employer that really needs to hire people with specialized skills from foreign countries, such as China, and apply for residence in the United States for them. The first priority category is people with outstanding talents, the second priority category is professionals and people with special talents, the third priority category is professionals, skilled workers and unskilled workers, the fourth priority category is special immigrants, and the fifth priority category is special immigrants. The priority category is investment immigration that creates job opportunities. Among these five categories of immigrants, the most common is the third priority category, which is professionals, skilled workers and unskilled workers.