BBC Bitesize: The ever faithful Bitesize is still a great one-stop shop for checking and testing your knowledge.
BBC Learning Zone: Provides a range of interesting video clips for a range of topics.
Woodlands Resources: A useful school website with a range of links and simple to use resources.
Look, Cover, Write, Check: SATs spellings tests.
Apps4Primary: Although designed for teachers, it does list a range of apps you may find useful for supporting your learning. Remember to ask the person who pays the bills for permission before buying or downloading!