Let's have some realism here

The kid is 16 years old. Bitching that he doesn't have experience and that this qualification is worthless, is like me saying GSCE science is worthless because I've got two degrees in physics and I've worked in commercial labs.

Stop thinking of this as "kid with certificate thinks he knows more than me". He's a kid doing his GCSEs who know has a good theoretical grounding in the area he wants to work in and also has as much experience as most of the "certs don't beat experience" crowd ever had at his age.

And the experience he gains after this will likely teach him more than they learnt as he understands the theoretical framework underpinning what he is doing.