I wrote it at UofT the past February and here's what I can recall:
Everyone was waiting outside of the building because we got there early; I was pretty nervous but saw some old friends in the crowd so we talked and calmed each other down (definitely better than waiting alone for 15 minutes). When the proctors let us in, we waited some more in the "lobby" of the building, then they called for the MDT takers to follow them into their testing room. The rest of us were split into two and were led to where we presented our photo ID to sign in. Then, we waited some more and were eventually allowed to enter the exam room (which looked like a small auditorium).
We had to put all our belongings in the front of the room, but were allowed to keep our watches (unless they were smart watches) and a sharpener. On the table in front of me was one big test booklet with all four sections of the exam, and four separate scantrons (if I remember correctly...), and a sticker sheet with our personal information. There were two pencils and a eraser, but you could ask for more pencils/a sharper pencil throughout the exam (I did not bring a sharpener with me but had no problems with pencils being dull, etc). . We could not have anything on our table other than the test booklet, the scantrons, our sticker sheet, and our photo ID.
At the beginning of each section, we put a sticker on the scantron for that section. There was a countdown timer projected in the front of the room. We were prohibited from flipping ahead to the other sections. The order of the tests were Bio, Chem, PAT, RC. There was a 10 min break outside the test room at the end of each section and we weren't monitored so some people talked (although I believe they shouldn't have). There were no blank sheets for rough work, but I found enough space in the booklet (if anything, you just need to do rough work for chem and PAT). You can write on the text booklets, but all answers must be transferred to the scantron.
The whole exam passed by in a flash for me, and I felt better coming out of it than I thought I would. Grabbed myself some treats while I was downtown and just enjoyed the rest of the day without thinking of studying. I hope the above walk-through calms you a bit. All the best on Saturday!