1. Use the scrollbar/slider at the bottom of the window to move between questions. You can move backwards and forwards between questions and change your answers if you wish.
2. If a Mark button is shown then pressing this will allow you to check your answers. You can still change your answers once you have pressed Mark.
3. If a Cheat button is shown you can press it and hold it down to see the correct answer.
4. The Finish button will end the test. You will normally be shown your marks.

Once you have finished a test you can usually use the slider/scrollbar at the bottom of the screen to review your answers to different questions.