https://myminimaths.co.uk/year-6-mini-maths/
http://www.satspapers.org.uk/Page.aspx?TId=5
All of these websites have materials that will aid revision. Don't forget there is also Spag.com (passwords were re-issued this week).
I also have a number of revision materials that you are able to borrow should you require them. Any questions, please ask :-)