As your children are reading their chapter, they should pause after each section and 'test' their understanding. It helps to take notes of the main points as they read. The act of taking notes and reviewing them will help children understand and remember. Be sure children understand that homework is their responsibility. Make yourself available but be clear about your role as supporter and monitor.
Good notes are important.
Organize them immediately after class while the ideas are fresh. Review them that same evening. Your children should review material more than once, well in advance, instead of 'cramming' the night before. Show interest in what your child is doing. Talk about successes and difficulties.