Help with frustrated boyfriend?

My boyfriend can is occasionally really easily frustrated when things don’t go his way. Most often it’s in relation to school (college students) where he doesn’t get as good a grade he’s expecting or messes up on a project/presentation. Whenever something like this happens and it pushes him over the edge he becomes really self deprecating, talking about how he’s the dumbest of his friends and classmates and he can never do anything right, things of that nature. I do my best to reassure him and comfort him but it’s never any help especially because I’m a lot more go with the flow and tend not to stress as much about grades and whatnot. Any advice on how to comfort him?
Help with frustrated boyfriend?
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