To learn English well on your own in junior high school, you can follow these steps:

1. Build a solid foundation: Focus on mastering basic grammar rules and vocabulary. Use textbooks, workbooks, or online resources to practice regularly.

3. Practice speaking: Find language exchange partners or join online forums where you can practice speaking English with native speakers or other learners.

4. Keep a diary in English: Writing daily will help you consolidate what you've learned and improve your writing skills.

6. Don't be afraid to make mistakes: Learning a new language involves trial and error. Embrace mistakes as opportunities to learn and improve.

By following these steps consistently, you can improve your English skills significantly.