One of the best things you can do is read everyday. Below is the link to the Oxford Owl Website where you can find different ebooks. We will add more sites as we find them.
Also on the Oxford Owl site are different spelling activities you can have a go at. As well as this the Year 5 and 6 word list is in the useful resources. Why not take 6 words each week and have a go at the different spelling practise ideas to keep your skills sharp. Where there are specific topic words you need to use these will be in the work set for different lessons.