I just scribbled the odd number or skimpy graph right into the exam paper, in the margin, and encircling words such as "least accurate" or "most suitable" (so I would be perfectly clear on what the question was after) and also drew arrows between relationships mentioned in the text and statements in the alternatives, crossing out obviously wrong alternatives... there is really no time to draw things in a neat way on a scratch paper, just jot it down right by the question itself. For the type of questions where you have two columns, like this
A A
A B
B A
B B
then I just encircled the two alternatives that were right in the first column and the two that were right in the second column, then underlined the alternative with two circles so I would not accidentaly mark the wrong answer on my scantron paper. I didn't trust my short-term memory enough so I both encircled the correct answer in the booklet and then immediately transferred it onto the scantron sheet.
Regarding luggage: Same thing here, the Dubs, there was a luggage room guarded by proctors. No bags allowed. Next time I'll get one of those "combat trousers", with huge pockets, which Bambi recommended in another thread. It was a bit difficult to juggle the passport, pencils, eraser, calculator(s), wallet and glasses as no bags are allowed near the exam room itself.