I wrote the test this morning and my experience was similar to the others, they let us in a half hour early and we stood in line which was surprising to me because I was thinking there would be seats at least during the interview but that wasn't the case. Officer asked me about my ID's and how many times I left the country, so she said that she didn't need copies since I never left the country. After that she asked me about my work history during the 2 years prior to my application, I was also asked about my address and where I lived before. I was then asked to go to the testing area and leave my wife with the officer. She then asked her similar questions about our residence and her work history as well as her exit and entry and checked all the stamps on the passport. I am assuming that she wanted to interview her separately to test her language skills and verify that her information matches what is on file. We both wrote the test and had different questions, my questions were easier than her's but I would say they both tests were fairly easy with a couple of challenging questions. They gave us the scores after we handed in our answer sheets and were asked to leave. Oath should be from 1 to 3 months after the test.
P.S There were 30 people in the room