Some jukus (or yobikos) have their own youtube channels.
Belows are some of them.
Unfortunately almost everything is explained in Japanese, but you can take a glance at what is going on in Japanese shadow education.
I hope you can feel their enthusiasm or seriousness.
・Sanaru Yobiko @will
・Toshin High School
*Yobiko is another category of shadow education in Japan as explained in chapter 4 of the book.