Morning Section Exam Scoring

Dear All – Does anyone have any insight into how the CFA Institute really scores the morning section of the exam? For instance, on the 2007 exam, question 1, the required return calculation is presumably worth 12 points out of the 180 total points in the morning. Does one tiny mistake in the calculation earn 11 of the 12 points or more like 9 or even 6? Anyone know? Many Thanks