How ahead of time did you book your CISI level 3 exam?

There is no specific time to book your CISI level 3 exam. As a matter of fact, it should be only booked when you are prepared and confident to give it a try. Given how long it takes to give the exam, it might take a few months or even a year to go through the subject matter, depending on your effort.

The CISI level 3 exam is a difficult test that tests your skills and knowledge of various areas. It's best to be prepared for the challenge by scheduling it appropriately when you're confident in what will come out if successful!