wtMaths consists of this web site and an app.
The web site contains an explanation of all the topics for the exam, and has been configured for desktop, mobile and print use.
The wtMaths app is available on the Apple Store. Lots of practice questions for the iPad and the iPhone. Try the app for free with a selection of 50 questions: additional questions are available as in-app purchases.
The wtMaths App is available for the iPhone and iPad on the App Store. The app is loaded with exam-style questions: in-app purchases are required to unlock all of the questions.