The best way to find out if you are ready for a higher level of playing is to try it.
many of Ben’s lesson are set up where the first time through the song is not as difficult as the next time through. I switch back and forth between beginner, intermediate and advanced depending on how much I want to be challenged that day. Some times I just want to learn something new but don’t want to spend a month getting it down so I go with the basic. Other times I hear something I just have to add to my playing so I will work on it until I get it if it take a month or a year.
It is really up to you. I’d say try listening to a few of the intermediate videos and choose a tab of something you are fairly familiar with (if there is one). Then try running slowly through the tab (repeating a measure at a time) to see what is involved in playing it and how well you might be able to adapt to the particular licks in that song.
It won’t be wasted time if you pick up one or two new licks from running through a more difficult tab that you can’t actually pull off in its entirety right away. I’ve increase my “bag-o-licks” greatly by dong just this.
Good luck and have fun!