First of all, we must have a correct attitude. The knowledge of the first grade is very basic, and most children in the class will have no problem as long as they study together. There is no classification between underachievers and top students. Everyone has his own strengths, especially at this age, and their strengths should be explored and encouraged. Moreover, living habits and views on the world are more important than some basic knowledge, and it is not good to leave a shadow on children's hearts.
Secondly, explore why some children do not do well in their homework, and then prescribe the right medicine. If it involves the family environment, you can consider talking to your parents. For some students who don't know at present, you can mention him from different angles.
My favorite TV series about primary school teachers is called Hot Blood Teacher. I was very moved after reading it. I hope I can help you. You are a good teacher who actively helps children solve problems.