Hi, what I do is when I don't want to practice LR for the fourth section, I just do a flex and add a problem set on my own and count it in as the fourth section.
Hi, you don't have to have ProctorU on your phone. The proctor will ask you to use your Macbook camer to check your room and your desk area, then he or she will ask you to use a mirror or the selfie mode on your phone to check your laptop.