This is a good resource if your child is sitting their KS1 Sat's this academic year. It has two full sets of the reading and spelling tests for Level 2 and Level 3 Papers. They are laid out exactly how they will be in the actual exam, so your child will become familiar with them and there is a comprehensive answer booklet. The answer booklet also has lots of good tips on taking the exams more than once, timing them, etc. However, don't forget that your child will also have to do a writing test, comprising of both a long and a short writing task. There are lots of books on the market but, for the writing task, I found Letts Key Stage 1 Success - Writing and Spelling: Practice Test Papers
very useful. Overall, though, this is a good buy, with test papers in the real format and it is useful to see the marks your child will achieve at Level 2 and 3.