6U
BBC Education have produced a whole host of materials for KS2. Follow the KS2 link and then select either Maths or English. Each area usually has an information section for reading, plus an activity and then quiz which is marked online. Some aspects require a subscription.
http://www.bbc.co.uk/education
A site with both Maths and English based quizzes which are marked as you go along.
http://www.educationquizzes.com/ks2/maths/
A site with a range of information and questions – great for revision purposes!
http://www.icteachers.co.uk/children/children_sats.htm
A site with links to old style Key Stage 2 Maths Papers, Maths Tutorials as well as Maths Games. Some of these games are linked to Memory and would therefore help pupils to retain key information.
http://www.online-maths-tutor.com/
These are “old style” Key Stage 2 test papers but are still useful for practise, and in particular, creating discussion around questions and strategies to answer. View on screen or print off for free.
http://www.emaths.co.uk/index.php/student-resources/past-papers/key-stage-2-ks2-sat-past-papers
Loads of Maths games on a range of Mathematical concepts.
https://www.sheppardsoftware.com/math.htm
A range of activities and games to practise a range of spelling rules and patterns.