To achieve a score of 120 on the high school English exam, you should focus on several key areas:

1. Vocabulary: Regularly study new words and phrases to expand your understanding and ability to use them correctly in sentences.

3. Reading Comprehension: Improve your reading speed and comprehension by reading a variety of texts, including novels, essays, and news articles. Make sure to understand the main idea, supporting details, and author's purpose.

4. Writing Skills: Work on developing clear, coherent, and well-organized writing. Practice summarizing, paraphrasing, and responding to questions based on the reading materials.

By focusing on these areas and consistently practicing, you can improve your English skills and aim for a 120 on the high school English exam.