Also make sure there are no purchased items on the iPad that are not in your iTunes Library, otherwise these will not be available after a Factory reset. For example, you may have a book, pdf, or magazine which you downloaded on the old iPad.
I think there is a method where you can sync the iPad data back to iTunes or copy e.g. the iPad Book to your iTunes Library.
https://support.apple.com/kb/PH20509?locale=en_AU
Cheers
Dennis