Starting December 01 2022, a new checkbox will be added to Special:Contributions on some  Flagged revisions enabled wikis that allows users to see pending changes by a particular user.
Screenshot of the interface:
 The change will be deployed to wikis where Flagged revs is not configured in protection mode, ie. where it affects all pages. A complete list of affected wikis is available at P40224.
The Growth team maintains the Mentor dashboard. One of the dashboard's modules is Mentee overview, which allows mentors to see various informations about users they are assigned to as mentors, such as their editcount, blockcount and similar.
As part of T297811: Mentor dashboard: Show information about mentees' pending changes on FlaggedRevs wikis, it was suggested to tell mentors how many unreviewed edits each of their mentees have, as a new column in the module. This would look like this:
The link from the number should lead to an interface where mentors can see all the edits pending review for that particular mentee. Special:Contributions can serve this fairly well.
T317145 is an alternative solution for the same problem.
- At FlaggedRevs-enabled wikis, Special:Contributions allows users to filter the contributions view to pending edits only.