2.0 GroupCourseResult object implements GroupDrillableResult

Represents an individual course result in the context of a group.

Field	Type	Description
`id` required	String	The unique ID of the course. Example value: `nYrK9udUcRS2kxa`
`proficiency` required	Integer	The average proficiency for this course by the members of this group. Example value: `99`
`timeSpent` required	Integer	The average time spent (in seconds) for this course by the members of this group. Example value: `545`
`evaluations` required	List of 2.0 ObjectiveEvaluation objects
`lastPracticed` required	Timestamp
`drillResults` required	List of 2.0 GroupDrillResult objects