To achieve a score of 80% in high school English and get into university, you should focus on the following aspects:

1. Master the basic language skills: Practice reading, writing, listening, and speaking to improve your understanding and use of English.

3. Study grammar: Understand and apply various grammatical rules to ensure accurate and fluent expression.

4. Practice comprehension: Read a variety of texts to enhance your ability to understand different types of content.

6. Write frequently: Practice writing essays, summaries, and responses to questions to improve your clarity and coherence.

7. Get feedback: Ask teachers or peers to review your work for improvement.

8. Use resources: Utilize online materials, study guides, and practice tests to supplement your learning.