I bought an iPad from somebody and noticed they left the iCloud on it, now my son disabled it ...is their any way I can fix it ?

Your options are limited...

Here are the Apple support pages that outline the Activation Lock - and the only mechanisms by which it can be turned off:

Activation Lock for iPhone, iPad, and iPod touch - Apple Support

Turn off Activation Lock – Apple Support

As you will discover, unless you are the owner of the AppleID that was last used to activate the device, or unless you can secure the cooperation of the previous owner, you’ll not be able to defeat or bypass the Activation Lock. Without documentary evidence that you are the original owner (such as sales receipt showing the serial number), Apple won’t assist - and nobody here will be able to help you.

The All Too Common SAD Reality of Buying … - Apple Community

judymartinez1125 wrote:

My iPad is disabled but it has the iCloud of previous owner ..anyway I can fix it ??

yes click this link here How to remove Activation Lock - Apple Support

judymartinez1125 wrote:

I don't have any contact with the person that sold it to me

Then the ipad is useless. Recycle it.

That iPad is now a useless device.

Please recycle this device responsibly.

Sorry.