HE IS A "BRIGHT" KID
Normally, we associate the word "bright" with some sort of light: "The sun is very bright today" or light bulb (bombilla): "The light bulb is too bright, we will need to change it". It can, however, be used in a different context to talk about: intelligence.
So, a teacher in the UK might say: "Your child (NOT CHILDS OR CHILDRENS) is very "bright", I think it would be a good idea to push him/her into a higher level class".
Hope that helps!
Soy el director de Daniel Smith + Partners. Tengo más de 15 años de experiencia enseñando inglés a españoles.