Excellent
I had the chance to teach a precocious talent, a kid who was enrolled in the 3rd year university maths class I was teaching when he was 13. 18 months later he was doing his PhD at UCLA, where he was a full professor at 24, won the Field's Medal (Nobel equiv for maths) in 2006 and a $3 million "breakthrough" prize in 2014, along with a bunch of other awards (Google him: Terry Tao).
What was interesting about him really was his normalness: he was still attending regular-for-his-age classes in non mathematical subjects, he wasn't socially weird, he was just
interested, and he had incredible insight for recognising common features in different domains of study and then working to make those intuitive connections into rigorous proofs. He was utterly pleasant. His father was a high-school maths teacher, who simply pushed the bureacracy out of the way to let Terry move ahead at his natural speed, then got out of the way. He was also mentored very carefully by the head of the department, and in fact still works primarily in his (Garth Gaudry) field of harmonic analysis.
I had a briefer encounter with Ruth Lawrence, who famously started a PhD in theoretical physics at Cambridge at 12: at 26 I was battling to follow a series of lectures on geometric quantization at the Collège de France by Alain Conne, she was breezing along, asking thoughtful questions and generally having fun at 14 (and the lectures were in French). Once again, no sign of a parent pushing.