Why does this matter? Because the bypass methods available for an iPad 3 are entirely different from those for an iPad Air or iPad Pro. Modern bypasses rely on server-side exploits or checkm8 bootrom vulnerabilities. The iPad 3 does not support the checkm8 exploit (that started with the A5 chip, but the implementation on the A5X is trickier and less supported).
The most reliable and safe way to handle an iCloud lock is through official channels: Previous Owner: ipad 3 icloud bypass
The iPad 3 creates a unique scenario compared to newer devices. The iPad 3 originally shipped with iOS 5.1. It supports updates up to iOS 9.3.5 (specifically, the Wi-Fi model stops there, while the Cellular model has a slightly different firmware architecture). Why does this matter
When official methods aren't an option, enthusiasts often turn to these workarounds: The iPad 3 does not support the checkm8