How to unlock iCloud locked Ipad

Forgetting the passcode that unlocks the device so that you can use it is different than the iCloud password. If you can’t remember your iCloud password in order to turn off Activation lock, you can try to recover it. Often it is the same password that you use for your Apple ID. Did you try that password?

If you want to try to recover it, go here.

If you forgot your Apple ID password - Apple Support

If you cannot recover the password, take the device and proof of purchase to an Apple Store and ask for their help.

You're going to need to find your original purchase receipt and take it and the iPad with you to your Apple Store Genius Bar for assistance. You must show you are the original owner of this iPad. If you aren't by some chance, you're not going to be very happy.

Do what this link says to do EXACTLY: https://support.apple.com/en-us/HT204306

Take a look at my reply above.

You can ask Apple for help, but without any proof you are the original owner, they may not help you.