Imagine a software engineer in Toronto who wants to move to Montreal. Her immigration plans call for a French test, her high-school French is rusty, and her work happens in English. She has a deadline and would rather not have to retake the test.
For a learner like this, preparation that focuses on the test itself matters: knowing what each section asks for, practising under timed conditions, and getting feedback on speaking and writing from a tutor who knows the format.
With a clear plan of regular lessons, extra practice at weekends, and plenty of French listening and reading in between, a learner like her could walk into the test knowing what to expect. Requirements change, so she would also check the current rules with the official sources.