A few parents have asked what they/their children can do over the holidays to either learn new things or revise their learning from Year 2. I would advise you to focus on mastering the Year 2 curriculum and to not start Year 3 work. So here are our recommendations.
If you wanted to buy textbooks for your children, GCP books are the best and are populated with up to date work that matches the curriculum. They are available from WH Smiths and shops like that but Amazon also sell them.