My son and I found this KS3 Science CD to be very good way to revise for Science. It takes you through the basics. If your child tends to learn more visually, then this will provide a very good foundation. The other benefit is that it is a great way to make the time your child spends on a computer more constructive and productive. Mine spent more time using the CD than he did reading it in the book. The topics are divide up into small section. Each topic starts with a few questions so you can gain a small idea of what your starting knowledge is, but I feel the aim is more to start questioning what you need to know as you start learning the subject. There very basic tests at the end of each topic. It will give you structure if you are tutoring your child your self and enable you to use a book if you want to expand on the subject areas or related questions from other source. I would not suggest that this should be your only source for revision, but is a good starting point.