People rebook, and the plan is counted back from this date, so it can be changed whenever it moves. Nothing you have already answered depends on it.
One date, saved as you pick it. Leave it empty and the plan paces you instead of counting down.
Used to plan your study. Time and centre below are optional; we never ask for your licence number.
Without a date there is no countdown, and the plan runs at your own pace instead of working backwards from anything.
It sets how many sessions there are between now and the test, which order the topics come in, and whether you are told you would pass in time. Move it later and the same work spreads out; move it sooner and the sessions get denser rather than longer.
Your answers, your run of days and your predicted score are all worked out from what you have done, not from what is coming. Moving the date cannot move any of them.
Three things start counting from it, each with its own page.