Without the original owner’s Apple ID and password to unlock the device to reset it to a default, factory state, there is no way you will ever get that iPad to work.
Apple will not help to defeat Activation Lock, either.
If you cannot get help from the person who sold you this device, try and return this iPad and attempt to get your money back as, currently, you have a useless electronic paperweight.
Next time purchase a new or refurbished iPad from Apple or purchase a new iPad from an Apple authorised reseller, or if you insist on purchasing used Apple mobile devices, do a search for a reputable Apple product reseller that sell older Apple products that are known to be “clean” and Activation Lock free.
Somebody like this.
https://www.powermax.com/new/apple/ipad/
I have been buying used Apple Products from this store/online store for many years.
Best of Luck to You!