Students always write their homework in their school contact books.
In fact, in that part of the world where I am now, students write their homework in their writing books and notebooks. But what they write in their contact books, while still in school, is the numbers of tasks and the numbers of pages (of their textbooks and workbooks), on which those tasks can be found.
So what word or group of words should I substitute for 'homework' in my sentence in order to avoid this ambiguity?
EDIT: If it's impossible to solve this by replacing only 'homework', then it's okay to replace the verb 'write', too.
In fact, having read some of the comments, I came up with this option:
Students always specify their homework assignments in their school contact books.
Do you think it's a good idea?