Take a look at this thread. It's long, but it may help you.
Re: Not impressed! No edit info, no library management!
And here:
iTunes 11 *****, can I revert to 10.x
What I ended up doing (note: I had already done the steps in the "...not impressed" thread above).
Uninstall iTunes 12 with AppZapper or AppDelete or similar.
Uninstall iBooks as above.
Delete these files:
1. /System/Library/PrivateFrameworks/BookKit.framework/Versions/A/XPCServices/com.apple.BKAgentService.xpc
(Note: you may need to force quit this service in Activity Monitor. Check to be sure it's not running.)
2. /System/Library/PrivateFrameworks/BookKit.framework/Versions/A/XPCServices/com.apple.iBooksX-SecureUserDefaults.xpc
3. /Users/*your home folder name*/Library/PDF Services/Add PDF to iBooks (ignore if file doesn't exist)
Restore your previous iTunes Media folders from backup.
Download iTunes 11.4 installer at http://support.apple.com/kb/DL1774?viewlocale=en_US&locale=en_US
Open iTunes 11.4.dmg file.
Use Pacifist to install, check use administrative privileges; choose replace at all prompts. https://www.charlessoft.com
Reboot computer.
So far, it looks as it did in Mavericks. I haven't tried to sync i-devices yet, though.
If you don't have a backup of your media folders, that first message thread should help you.