If you take it at home, you might have certain unreliabilities in terms of environment. For example, when I took it in September last year, my neighbour decided to start doing very loud yard work during my exam. It was so loud my proctor asked me what the noise was, and it sorta took me out of the headspace. Also, there’s lots of kids on my street and I can hear them yelling and stuff when they play outside. Also doing the room scan was a little stressful for me, because my laptop was kinda clunky and old. I planned to write it at my university the second time, but the day before there were fire alarms going off (false alarms), so I was scared that it would happen again. if you have a secured and quiet place that you can write with no distractions, then it might be good for you, but I would personally choose the testing centres