If you think you’ve already got an over-the-top collection of your child’s school work, it’s probably a great time to start thinking about how you’re going to keep it
There are great school memory books that you can buy at Costco, and various online locations (amazon, indigo, etc.), but the option that has worked for our family is to create a school years time capsule. It is basically a memories book with as much space as you would like.

Give each child their own File box (available at Staples, and Your
Whatever method you choose, the key is to get started. Time goes by so quickly once your children are in school, and you don’t want to miss out on documenting any special moments ☺