He know how to do the work it just when the teacher is explaning the lesson is the problem.

What does he do while the teacher is explaining the lesson?

It seems like the issue you're facing is not with understanding the work itself, but rather with comprehending the lessons explained by your teacher. Here are a few suggestions to help you overcome this problem:

1. Active Listening: During class, make a conscious effort to actively listen to your teacher. Focus on what they are saying, take notes, and ask questions whenever you need clarification. This will ensure that you stay engaged and attentive throughout the lesson.

2. Pre-Reading: Before attending a class, try to pre-read the assigned material or review previous lessons related to the topic. Familiarizing yourself with the subject beforehand will make it easier to follow along during the lesson and understand the teacher's explanations.

3. Participate and Ask Questions: Don't hesitate to actively participate in class discussions or ask questions when you don't understand something. Remember that your teacher is there to help you learn, and asking questions will not only clarify your doubts but also improve your understanding of the topic.

4. Seek Additional Resources: If you are still struggling to comprehend the lesson, consider seeking additional resources outside of the classroom. Look for online tutorials, textbooks, or videos that cover the same topic. Sometimes, a different explanation or perspective can make a concept clearer to you.

5. Form Study Groups: Collaborating with classmates can be beneficial for your understanding. Organize study groups where you can discuss the lessons together, share your understanding, and help each other fill in any gaps in comprehension.

6. Meet with Your Teacher: If you continue to struggle with understanding the lessons, schedule a meeting with your teacher outside of class. They can offer personalized guidance and address any specific issues or challenges you are facing.

Remember, everyone learns differently, and it's normal to have difficulties understanding certain concepts. By implementing these strategies and seeking additional support when needed, you can improve your comprehension and overcome this problem.