As an appointee, this is something you really do not need to be worrying about and something you really can't understand until you get here.
I would also question Hornetguy's assertion that The hardest ones to get are the wing and group jobs. When the time comes, you will see that most...
There is absolutely no need to bring any sort of calculator for your math classes here...it will not be used/will not be allowed. Take this from someone who has gone through the aero program.