This is the final test. If you pass, then you are an advanced English speaker!
We thought long and hard about how we could properly test your English at an advanced level. In the end, we decided the only way to do it was to just record people speaking about various topics. They didn't use scripts or try to make it easy. They just spoke naturally. This is real, unscripted English, not a standard English textbook.
So, basically, either you understand them and are an advanced English speaker, or you don't, and you aren't.
Listen to the audiobook and find out if you are advanced or...not.