These exams are scored using an auto-grading process.  The question types appearing on these exams (true/false, multiple choice, and computational) lend themselves to auto grading.

Auto grading allows you to access your results the moment you “finish” the test.  In addition, 'average statistics' within the various results page are computed  on a real-time basis, allowing you to continually gauge how well you have performed relative to your competition. 

Knowing how you score relative to your competition, weeks before you take the actual CAS exam, allows candidates to concentrate their efforts in areas needing improvement during the remaining 3-4 weeks before the actual exam.