أَعَدَّ الْمُعَلِّمُ الدَّرْسَ وَرَاجَعَ الطَّالِبُ الْمَسَائِلَ.
The teacher prepared the lesson, and the student reviewed the problems.
These are separate assertions linked by a shared educational activity. Wāw joins distinct but related judgments; it does not turn the student's review into a restatement of the teacher's preparation. A jāmiʿ need not be the repetition of a word or agent; it is a meaningful connection relevant to the act of coordination.
If the second clause introduces an apparently unrelated event, the coordination may feel unmotivated. A wider narrative could nonetheless give the pair a common setting. The search for a link must therefore examine the immediate clauses and the wider context together.