The following websites would be beneficial for children in Year 6
http://www.crickweb.co.uk/Key-Stage-2.html
https://www.tes.com/teaching-resources/primary-national-tests/ks2-sats/maths
https://www.tes.com/teaching-resources/primary-national-tests/ks2-sats/reading
https://www.tes.com/teaching-resources/primary-national-tests/ks2-sats/spag
http://www.primaryworksheets.co.uk/
http://www.schoolslinks.co.uk/