I have heard of the Book of Enoch and am somewhat familiar with its background as a text and what its contents are basically supposed to be about. I have not read it yet, though I would like to some day just to make my own conclusions upon it.
The fact it is alluded to in the other Biblical books is pretty much what caught my attention to it, but it is fair to say it could just be a forgery. My initial thoughts when I learned of its existence was that it might be a gnostic text, but if its oldest copies really are dated to at least 200-300 BC, this would give it a little bit better veracity as that would make it pre-date gnosticism. Either way though whether Book of Enoch is actually by Enoch, I am of the opinion that even just the short passages in Genesis are pretty sufficient in driving home the point that some pretty messed up stuff happened before the Flood, so really The Book of Enoch is somewhat irrelevant to me. Though if it is true that would make it the oldest work of literature in history. As for the Book of Secrets of Enoch, I have never even heard of this before.
As for Jubillees, I have heard of it by name, but never really investigated it nor read it and quite honestly I have no idea what is written therein.
If Enoch didn't have more important work to do when he gets back to Earth, it be a cool question to ask him if he actually wrote or dictated the Book of Enoch.