Work through the Levels starting on Level 1. The build on each other and add another level of difficulty. If you find a level challenging, watch the video example to help you. Use the answers to mark you work after each level. 

You do not need to complete all the levels in each lesson! Work through the levels until you have got to the edge of your understanding. You could come back to this lesson at a later date, or move on to the next lesson.