over·achiev·er 
/ˌoʊvɚrəˈtʃi:vɚ/ noun
plural over·achiev·ers /ˌoʊvɚrəˈtʃi:vɚ/ noun [count] : someone who has much more success than is normal or expected especially at a young age
▪ She is an overachiever who plans to attend a top college. — opposite underachiever
▪ She is an overachiever who plans to attend a top college. — opposite underachiever
— over·achieve /ˌoʊvɚrəˈtʃi:v/ verb, over·achieves; over·achieved; over·achiev·ing [no obj]
▪ The team overachieved last year and won the title. ▪ an overachieving student
/ˌoʊvɚrəˈtʃi:v/ verb, over·achieves; over·achieved; over·achiev·ing [no obj] ▪ The team overachieved last year and won the title. ▪ an overachieving student
