Hi,
30 mins before the check-in link gets activated. They will send you an sms with a link. That link is used to take
A) Your photo in clear background

Photo of your id card (only had option of drivers license and passport)
C) Front of your workstation
D) Back of your workstation
Note taking the photos can take a fair amount of time. I have some photo frames on my room and they had no objection to it. I guess they wont unless it behind your workstation.
After all photos are submitted the webcam link is activated and you should wait in view of the cam (took 3-5 minutes) for a proctor to open a voice call. They were very nice and very friendly.
The whiteboard is not difficult just less efficient than drawing up network diagrams on paper. Its identical to the practice one.
Hope it answers your questions. Do let me know if you need other info and all the best.