How can I reset an iPad without the Apple ID password?

If the iPad is Activation Locked and you don’t know the password to remove the lock, there is nothing that you can do to remove it.

Find My iPhone Activation Lock - Apple Support

I don’t mean the passcode that unlocks the iPad. I am talking about the Apple ID and password that you need to remove activation lock or turn off Find My iPhone as described in the support article.

If you forgot the Apple ID, you can try to recover it.

If you forgot your Apple ID - Apple Support