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To do exceptionally well in something, especially an exam or other high-pressure situation. I feel like I aced that interview, so I'm pretty sure the job is mine. I managed to ace that test without even studying for it.
To achieve total success at something, or to complete something to the best of one's ability. I'm not worried, I always ace it at job interviews. I'm sure he'll ace it at the match tomorrow morning.
Accomplish something with success, as in I'm sure he'll ace it when he takes that bar exam. The verb ace originated in tennis with the meaning "to hit an unreturnable serve against an opponent." The idiom ace it, however, originated as student slang for getting an "A" on an exam or in a course but soon was extended to other successful accomplishments. [Slang; mid-1900s]