overachiever
ove·rac·hie·ver
noun
1.
a student who attains higher standards than the IQ indicated
Origin
From overachieve + -er or over- + achiever.
Related words
Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.