I do not believe there is a right or wrong age for commencing preparation for your child. It depends on how you feel about it and how to introduce it. I started my boy who is now in Yr7 at DGS from age 9 doing the odd maths, VR & NVR here and there with no pressure at all. He enjoyed it as it was done in a relaxed manner. By the time, proper preparation started for himin Yr5, he was used to the idea and no pressure felt. Whatever you do make sure he has fun and enjoys it. For now, concentrate on mental maths, reading/simple comprehension, words and meaning, simple VR and NVR up to age 9. You can use BOND, LETTS etc. Please bear in mind that the exam provider will be changing soon for next year. So watch this forum.