Deanna, the Mercury-Uranus conj in Pisces is a sign post for me. It indicates an active and changeable mind, with ideas of his own, and perhaps a mind more suited to creating something new and unique to him, than to following an organised body of thought which has been created by others (which in essence, Maths tends to be.)
Your son's mind may not, at 11, be terribly organised, but Science would appeal to him, since it is based upon concepts and ideas, many of which are new and exciting to children. That Jupiter in Scorpio probably wants to know why something is so.
As for the Chinese, perhaps he has a flair for languages. The Mercury-Uranus certainly describes a mind which appreciates flair and the unknown, rather than order.
It's also possible that your son does not yet appreciate the reason that Maths is important. It can be a very boring subject for some children.
I keep going back to the Mercury-Uranus conj in Pisces. It describes a unique mind, one which perhaps daydreams about fanciful, even preposterous ideas. It is a gift he has, but mainstream schooling may not be where he discovers such gifts.
[And Maths and Science skills are only related when you get into more advanced sciences, such as Physics, or Astronomy. Maths is fundamental to calculations required to pursue such subjects.]