For the imaging test:

Review the basic concepts at the back of Chapters 3 & 4.

See the Chapter outlines/objectives below.

You'll need to create a block diagram for the scanjam device below. Who knows- you may have a "scan" image file of those objects he placed on the scanner to work with in VAB.

You'll also notice that the video you're watching is a conceptual one- the hardware and electronics is waiting for you to devise it!