are we allowed to write on the exam that contains the questions?
Dear homie, Yes, yes you are. Just don’t go writing all over the scantron bubble sheet that they give you. This would be a big no no. Good luck.
You cannot write on the cover or the back of the question booklet either, only inside I believe.
are the blank margins of the questions booklet the only practical places to write calculations on?
You can write anywhere inside the questions booklet.