Does anybody know how these carbon copy system worked during the exam?
Sure. Basically the carbon copy answer sheet layer packet is separate from the actual test question packet. Within the answer sheet packet, there is an ink paper layer which underlies the main paper answer sheet that is filled in with pencil like any other standard Scantron-style answer sheet. The difference is that after the standard A,B,C,D bubbles, there is a “backup box” where, if the candidate messes up in filling in one of the circles or wants to change an answer, they can manually write their letter selection in the box (because you can’t “erase” circles on the copied sheets after the main answer sheet once they’ve been filled in). This writing, of course, also transfers to the copied sheets via pressing on the ink sheet. So basically, let’s say you filled in “B” for an answer, and then in your final pass, you want to change the answer to “A.” You would put a line through the blackened “B” circle and manually write “A” in the backup box for that question line. GARP will only grade your manual answer as “A” for that question.
At the end, the candidate hands all sheets and packets back in to the proctors.
EDIT: I’ll add one more thing – it wasn’t the best system I’ve ever used to take a test, but I’ll say that the answer packet was pretty tightly glued together, so it wasn’t a horrible pain in the @$$ to answer via this system. It wasn’t like I was juggling several sheets that wouldn’t stick together or anything. You’ll get the hang of it within seconds after receiving the answer sheet.