Here's a break down:
Class CP
Applicants must be at least 15 years old who have passed the required vision and knowledge test when obtaining the license
Class CP drivers must have at least a 21 year old valid license drive in the front seat of the vehicle when driving.
This permit is valid for 24 months
Class D
This is a provisional driver's license for Class C drivers
May not operate a vehicle between 12:00 midnight and 6:00 A.M. until the driver obtains a Class C license.
May not operate a vehicle between 12:00 midnight and 6:00 A.M. until the driver obtains a Class C license.
First six (6) months - No persons not family members for the first six months.
Second six (6) months - only ONE non-family member under 21 years old can be a passenger inside the vehicle
After one year - no more than THREE non-family members under 21 years old can be passengers in the vehicle
For more information - visit the Georgia Department of Driver Services