Get Comfortable with the Downgrade Process
If you run into annoying problems on the beta you can downgrade back to iOS 12.
As of right now, you can downgrade to iOS 12.4. Unfortunately you can't downgrade to anything older than iOS 12.4.
Apple's closed off the downgrade path to iOS 12.3.1, iOS 12.3, and older versions of iOS 12.
We highly recommend getting familiar with the downgrade process before you download the iPadOS 13 beta onto your device.
If you don't feel comfortable with the instructions, you might want to stay put on iOS 12.