Delaying one Salah and combining it with the next one at the time of the latter because of exams

Q: I am a student and my exams start at 4 P.M. And end at 7 P.M. As time for the Maghrib (Sunset) Prayer is about 4:30 P.M. (Part No. 5; Page No. 91) And time for the `Isha' (Night) Prayer is roughly 5:50 P.M., attending such exams causes me to miss the Maghrib Prayer. Is it permissible for me under such circumstances to delay the Maghrib Prayer and combine it with the `Isha' Prayer at the time of the latter? Please, provide me with your beneficial advice.

A: You are required to perform the Maghrib Prayer on time for Allah (Exalted be He) says: Verily, As-Salât (the prayer) is enjoined on the believers at fixed hours. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.