As-salamu alaykum, I have a exam tomorrow and it starts before Dhuhr and ends after Dhuhr. Can i combine? I usually finish when there is not time left. JazakAllah khayran

If Dhuhr time is still in when the exam ends, pray it then, as its time lasts until Asr. If the exam runs into Asr time and leaving would harm you, Shaykh Ibn Uthaymin allowed combining.