You have 6 "times" that you can sit down an write the CAA exams. 1 "time" equals 10 days. From the moment you start writing your first test you have 18 months to finish them all.
You can choose to take the exams whenever you want to during those 10 days.
During these 10 days, you can take it in your own time and you can even divide the subjects over several "times".