If you didn't master English in junior high school, don't worry. It's not too late to improve your skills. Here are some steps you can take:

1. Review basic grammar and vocabulary: Use online resources or study materials to review the basics of English grammar and vocabulary. This will help you build a strong foundation for future learning.

3. Join an English club or find a language partner: Participating in conversations with native speakers or other learners will give you valuable practice speaking and listening to English.

4. Keep a journal: Writing in English every day can help you improve your vocabulary and grammar skills. You can also use this as a way to reflect on what you've learned and identify areas for improvement.

By following these steps and dedicating yourself to consistent practice, you can gradually improve your English skills and succeed in high school and beyond.