To self-study high school English from junior high level, you can follow these steps:

1. **Review Grammar and Vocabulary**: Review the key grammar structures and vocabulary learned in junior high to ensure a strong foundation for high school English.

3. **Read High School Level Texts**: Read books, articles, and essays written at a high school reading level to improve comprehension and expand your vocabulary.

4. **Practice Writing**: Write essays, summaries, and responses to texts to practice using the language and applying grammar rules.

6. **Take Online Courses**: Consider taking online high school English courses or using resources like Khan Academy or Coursera to learn at your own pace.

7. **Solve Problems**: Practice solving English problems similar to those found in high school exams to prepare for standardized tests like IELTS or TOEFL.

By following these steps consistently, you can effectively self-study high school English from junior high level.