To learn English well in junior high school, it's important to focus on building a strong foundation. Start by learning the alphabet and phonetics to improve your pronunciation. Practice daily with vocabulary and grammar exercises, and don't be afraid to make mistakes - they are part of the learning process.

Immerse yourself in English as much as possible. Watch English movies and TV shows, listen to English songs, and read English books or articles to familiarize yourself with the language in real-life contexts. This will help you understand how words are used in different situations.

Lastly, remember to have patience and perseverance. Learning a new language takes time and dedication, but with consistent practice, you'll see improvements over time.