Each practice area has a set of five questions to answer. 
If you answer incorrectly the associated Grammar explanation 
will automatically come on. You may also click on the 
Grammar Book icon at any moment if you want a grammar explanation 
of a given question.

Once you have answered the five practice questions of the practice
block, press the exit icon and save, then choose a new practice area.
If you have finished all the areas, the program will automatically 
continue.