Because it's a comparative passage, he goes through passage A and half of the answers in the passage explanation video. It is basically part 1 of this video.

What do you guys think: if I feel that I haven't mastered MBT questions, is it best to move on and continue the program while still practicing MBT on the side? Or is it best to focus solely on MBT until I feel comfortable moving on? #help

You got this! Keep practicing and you will improve! We are all in similar scenarios, this test is hard.