This is the 5850th most frequent Turkish word.
sınavında
"In his/her/its exam" or "in the exam."
In this sentence, "sınavında" is used to specify the context of the event, indicating that Ali excelled in a particular exam, namely the math exam.
Ali matematik sınavında çok başarılı oldu.
Ali performed very well in the math exam.
Here, "sınavında" refers to the scenario in which Mehmet lost his notebook, specifically during the chemistry exam.
Mehmet defterini kimya sınavında kaybetti.
Mehmet lost his notebook during the chemistry exam.
"Sınavında" in this sentence suggests a setting or context where Ayşe's carefulness was required, namely in the physics exam.