Eli Ingle says his exam successes show it is possible to be educated at home right up to A-level.
Hundreds of families across the UK every year choose to take their children out of school and teach them at home.
But but very few continue this past GCSEs into the traditional sixth-form stage.
Eli, from Sheffield, already has two A*s - in business studies and sociology - and is hoping for similar high standards when he gets his psychology result later today.
He said he thought about going back to college for A-levels but he and his family had enjoyed his home education so much he wanted to carry on.
"To me, that was like going back to school in a lot of ways which was exactly what I didn't want to do," he said.
"So it just seemed like a natural progression to move on to doing the A-levels."