I will start with gathering some data - how big the problem is?
Next, it's good to ask question why they do not take books with them.
Definitely I will asked them if they have some suggestion how to solve the problem.

Potencial solutions:
- lockers in school
- only one book per table
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The reason that they behave like this might be that they are not interested in that subjects and find it boring. to resolve this problem firstly u must try to convince him/her that is it very important to bring the books and that they should not disturb others who are studying. secondly the teachers should punish the children who dont bring the books and check it regularly!

hope my answer helped u........... ^-^
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