Welcome to the forum!
Lots of people go over the course multiple times or repeat sections. So you are doing the right thing if you feel that would help. I had to go to the lesson video a couple of times because the slow workout was coming at me too fast. 
Did you get through the Billie Jean lesson? Because it’s famous for getting people off track ( Billie Jean is a Wicked Mistress ).
I would recommend going back to the lessons you can nail and then progress from there. That way, you can see where you can improve. Also, practicing Billie Jean endlessly will get you good at Billie Jean, but it’s not the magic lesson to all things bass. 