Listener: Jackson ... left school at the age of 15 (with a certificate).
So he's a high school dropout. Thanks for posting.
I'm not sure what the process was when Jackson left school at 15, but I know that the current process in the US is so low that those that pass really only need to demonstrate very limited skills in English and basic algebra and geometry. That's it.
Anyone of even below average intelligence can pass it. It is not even remotely rigorous or difficult.