我有学霸的心却是学渣的命
[wŏ yŏu xué bà de xīn què shì xué zhā de mìng]
I have the heart of a straight-A student, but I'm destined to be an underachiever. This implies that someone has the ambition and drive to do well academically but doesn't achieve the results they aspire for due to lack of capability or effort.