You can do the Practice exercise as many times as you need to reinforce the concepts and skill sets. There is no limit set for this exercise. Remember that at any time you would like a reference on what the idea is or how to complete this task, click the eBook button to display this portion of the CCI Learning courseware as a learning tool. In fact, after completing the Practice exercise once, if you are marked wrong on a task, you can click on the Practice exercise again to further practice the skill set that you are required to learn.