Am I allowed to mark up the answer booklet on the SAT?

I’m just curious if we are allowed to write anything besides the normal bubbled in answers on the booklets.

You can write in the question book. You don’t get to keep it at the end.

But is that the only thing I can write in? Am I allowed to write in the scantron answer booklet?

The answer book that gets graded by scanning/reading pencil marks? I wouldn’t advise making stray/random marks on that on purpose.

What/why do you want to write in it?

To calculate right?