To master English in junior high school, you should follow these steps:

1. Build a solid foundation: Focus on mastering basic grammar rules and vocabulary. Practice regularly by completing exercises and reading English materials.

3. Speak often: Don't be afraid to speak English! Find language partners or join an English club to practice speaking and improve your communication skills.

4. Keep learning: Continue to learn new vocabulary and grammar rules. Use flashcards, mobile apps, or online resources to stay motivated and track your progress.

By following these steps, you can gradually improve your English skills and become proficient in the language.