In order to ace an exam, you do not necessarily have to be the best —even an average person can excel if he/she can understand the “system” and do exactly what is expected. 
Ili kufaulu mtihani, sio lazima uwe mahiri zaidi - hata mtu wa wastani anaweza kufanya vizuri kama unaufahamu "mfumo" na akifanya yale ambayo yanatarajiwa.