6 diget number that will coincide with the course you would like to purchase from The Princeton Review https://www.princetonreview.com/medical/mcat-guarantee?ceid=rc-cards-v3
How to Enroll and Get Your Course ID
To enroll in the MCAT Ultimate Course, you'll need your Course ID, which identifies the specific class section you're joining. To find your Course ID please navigate to the following link: https://www.princetonreview.com/medical/mcat-ultimate?ceid=nav-gd