need to unlock my apple iPad received as gift

You CANNOT unlock the iPad. Only the person who set up the iPad originally can unlock it. Give it back to them. It's useless to you. Apple won't help you and we can't help you.

Activation Lock is an Anti-Theft mechanism which can ONLY be turned off with the proper credentials.

If they have the original purchase receipt with the iPad serial number, they can request assistance from Apple. If they don't and they can't anywhere with this link the iPad us useless --> Turn off Activation Lock - Apple Support

I hear what you're saying, but long ago, it was super easy to steal an iOS device, wipe and the thief got full access. Apple takes personal security VERY seriously and Activation Lock is one of the better things they've ever introduced.

It's up to the user to know simple details, such as their own Passcode, Apple ID and Apple ID Password. These are important pieces of information. It boggles my brain that people don't jot important pieces of information down somewhere for safe keeping, but most people don't.

There are ways to get into the device with the link I provided. But none of them are options you can do anything with. The previous owner will need to do what is required.

You're welcome and good luck.