Answer: Collective/general grade
Step-by-step explanation:
An exam most times could be difficult enough that the lecturer makes it open for everyone to work collectively to get the result. Although, in most cases like this, it's not everyone who would contribute as some person's would view it as an opportunity to relax and leave the task for others but despite that, everyone would still be awarded the same score for it being a collective effort. They are some person's in the group who won't want to fail and would do their best to come up with a result.