If you have Notability for Mac, the easiest way to sync your notes is to turn iCloud on inside Notability on all of your devices.
You can also export your notes to iTunes.
1-Connect your iPad or iPhone to the computer
3-Select iPad or iPhone from the top right of the library. In the "Apps" section at the top of the library, choose Notability
4-Scroll down to the File Sharing window
5-Open Notability on the iPad and tap the export button in the upper left of the library. It looks like an arrow going out of a square
6-Select iTunes from the export options.
7-Select the notes you would like to export and the format for the notes
8-Tap "Send to iTunes". Your exported notes will appear in the file sharing window in iTunes. You can then drag the notes to your computer desktop or another folder on your computer.