closing calculator with ALT+C shortcut

I cant seem to have found it discussed here but sorry if it has but, yk how on medify to select an answer after having the calculator on you either have to press alt+c again or use you mouse to click off the window,

it doesnt seem to have this feature in the oqb so everytime i want to enter an answer i cant use the A,B,C,D,E shortcuts without moving to my mouse and clicking off the calculator. seems menial ik but it does disrupt the flow a little and im trying to increase my qr speed as im not getting past 700 or 25/36 and my exams in 4 days,

whenever i use the mouse i also tend to accidentally choose the wrong answer due to misclicking.

in summary will the alt c to close the calculator be present in the live exam or should i get used to the mouse rather than keyboard.