Using the wrong aid is equal to cheating. So be sure, that you have prepared (with) the right aids.
There are only the approved aids allowed on the table
Move bags etc away from you (e.g. put them unter the table)
Turn of all communication equipment and put them into your bag
Any communication that is not directly directed to the examiner is considered to be cheating.
Cheating leads at least to a failed exam, in serious cases to an exclusion of the course.
In my exams it is like the following:
CD: only non-programmable calculator
EE1: non-programmable calculator and 1 two-sided DIN A4 page and handwritten formulary (or 2 one-sided DIN A4 page and handwritten formulary)
DS: no aids allowed
You do not need additional paper. It is useful to have – beside a document-proven pen – also a ruler and coloured pencils with you.
Generally, examinators do not have to allow questions.
In my exams you are allowed to raise questions, but only about checking the given facts.
So, “why is the resistance given without unit?” would be a valid question and even a hint for me, that I might have done a mistake.
On the other hand, “can I use ohms law here?” is focussing on the solution path not on the facts.