This is the 15209th most frequent Turkish word.
sorularının
"Your questions."
Here, 'sorularının' denotes questions that belong to 'the exam', describing their difficulty level.
Sınavda sorularının zorluk derecesi yüksekti.
The difficulty level of the exam's questions was high.
In this sentence, 'sorularının' refers to questions owned by 'Ahmet'. It is possessively modified with 'ın', making it 'of Ahmet's questions'.
Ahmet'in sorularının cevaplarını bilmiyorum.
I don't know the answers to Ahmet's questions.
In this context, 'sorularının' indicates questions contained within 'the book', suggesting solutions are provided.