How can i motivate my son to write in school and give his full attention to the class?

i don't know your child's age, but if he is in a small grade, then i guess you should not worry too much. if your child is in a mid or higher class, maybe you should revise his home routine and make some space for studies, in addition to what he has now. sometimes, children who do not have a set timetable at home find it difficult to concentrate in class. try it out for a month or two and see how it goes.