dont do a retake.

an 86% is 16 points worth of wasted effort. the exam is pass or fail. theres only 4 examiners in the entire nation that care what you got on the written.

"whoa, you only got a 72%?"
"yeah, i didnt know my school requires it done before the end of the course, so i only had one night to study. my instructor and i went over the stuff i got wrong though"

no one cares