Nope, no calculators allowed. The battery of tests sent out by BA is a bit misleading. Only a couple of the types in the battery are of the type used at the assessment day, not all of them. You need to read the literature that comes with the battery of tests CAREFULLY.
I am aware of at least one candidate not having the required hours at the time of the interview but being offered a job ...... and subsequently having the hours by the time the course began.