To self-study biology for junior high school in English, you can follow these steps:

1. Obtain the curriculum and textbooks: Find out which biology textbooks are used in your area or similar regions and purchase them. If possible, get the teacher's guide or study materials to understand what is expected of you.

3. Practice with flashcards: Create flashcards for terms, concepts, and processes to help you memorize key biological information. Apps like Quizlet or Anki can automate this process for you.

4. Solve past exams and sample questions: These will give you an idea of the types of questions you may encounter on a biology exam and help you identify areas where you need more practice.

6. Regularly assess your progress: Take mock tests or quizzes to check how well you're understanding the material. If you find yourself struggling with a particular topic, seek additional explanations or resources.

Remember to allocate enough time daily to cover all topics and stay consistent with your studies.