He is suffering because of his Muslim colleagues’ laziness in studying; should he work with non-Muslims?

No File Exists
Check below answers in case you are looking for other related questions:
Making friends with a kaafir woman
Can Muslims settle in kaafir countries for the sake of a better life?

No File Exists
Related Answers:
Ruling on saying that the attitude of the kuffaar is better than the attitude of the Muslims
One who lives among people who commit shirk
Celebrating daughter’s reaching adolescence
Making friends with a kaafir woman
Can Muslims settle in kaafir countries for the sake of a better life?

Recommended answers for you:
Conditions of eating meat slaughtered by the Jews and Christians
Eating habits and diet of the Prophet (peace and blessings of Allaah be upon him)
The virtues of ruqyah and du’aa’s to be recited therein
The importance of saying salaam and returning the greeting
Removing hair and nails during the menstrual period