Install all soft wares the required for Exams.
Demo is very important,it is helpful in checking camera settings.If there is a problem with the Sw Email Vu with screenshot
Always use direct line internet,wifi is not favored by Vu overseas, Stop downloading of other files in your pc such downloads will slow the speed of net.
Make your pc virus free and capacity and storage should also be good.
Keep the number of overseas exams department and add their Id in Skype also
it happend to me before and i had to re exam for that subject and pay $90 for it.