How to teach a junior one student to learn English?

Give him to me. Ha ha.

Start with words, recite them every day, and learn basic sentence patterns and grammar. After mastering basic sentence patterns, do some reading. In fact, many textbooks are like this.

In fact, it is word-sentence (grammar)-reading (application).

Start from the diving depth and gradually increase the difficulty.

Although I have never been a tutor, it seems to be such an iterative process to teach myself. I hope it helps you.