If you would like an aid to help learn, remember and practice Emergency Life Support (ELS) skills then there are a few applications that may aid you. There are two applications that we are aware of, there is the British Heart Foundation's Pocket CPR which teaches CPR. You may want to use a pillow to represent some ones chest. The other application is Unit 9's Life Saver which walks you through various scenarios asking you what to do at various steps. Both are excellent aids to keeping your skills up-to-date.
Disclaimer. You use these applications at your own risk, we cannot be responsible for external content and accuracy. Second issue, do not try any of the skills shown on anyone unless it is a real emergency.