Here's the grading scale. I don't see where it says you have to finish. I see it awards an average score for a steaming pile of dog vomit. Provided what you checked a lot of boxes (sorted relevant from irrelevant facts, cited cases and quotes, used the right form, followed the directions, etc.) you will be fine.
Score of 6
A 6 answer is a very good answer. A 6 answer indicates that the applicant has a thorough comprehension of the task, the relevant factual and legal materials, and uses them to write a legally supported, well-written responsive product in the time allotted.
Score of 5
A 5 answer is an above average answer. A 5 answer demonstrates that the applicant has a fairly complete understanding of the task, understands most of the relevant materials, and uses them to write a legally supported, reasonably well-written, mostly responsive product in the time allotted.
Score of 4
A 4 answer is an average answer. A 4 answer indicates that an applicant has a fair understanding of the task and understands enough of the relevant materials to incorporate them into a satisfactory, though not completely responsive, product in the time allotted.
Score of 3
A 3 answer is a somewhat below average answer. A 3 answer is inadequate. It shows that the applicant has a limited understanding of the facts, issues, and applicable principles of law and is not able to write a satisfactorily responsive product in the time allotted.
Score of 2
A 2 answer is a below average answer. A 2 answer is significantly flawed and shows that the applicant has only a basic understanding of the task. It shows the applicant failed to grasp most of the relevant facts and law and thus has not produced a useful product in the time allotted.
Score of 1
A 1 answer is a well below average answer. It indicates a failure to understand the task. A 1 answer shows virtually no ability to identify the relevant facts or law in the time allotted.
Score of 0
A 0 answer is appropriate when an applicant does not write an answer at all. It is also appropriate if an answer is completely unresponsive to the question.
Take another look at that. "mostly responsive product in the time allotted." In other words, you didn't finish but you mostly did what you were told. THAT's worth a 5.
A 4 is you didn't even do what you were told, but close enough, and you didn't finish here either.