Isn't boredom a sign of low internal motivation? What does HE feel passionate about? What does HE want to get better at or develop?
I had a "coaster" at high school who got by with good enough results while being capable of much better. No competitive instincts, loafed around with his mates and online (parentally controlled, obviously) and was glued to his phone.
The only thing he showed passion for was music, composing, playing and performing classical and modern. He got to Conservatoire Degree Entry level and stopped to focus on his school exams.
Did he tranfer that passion to his schoolwork? Like hell he did.
Scraped an 82% and blamed the shortfall on his teachers not liking him....
We had been telling him to "Wake up! Realise your potential! Put some effort into it! Take off the handbrake!" for years (see my username!) and all we got was lip service because he had NO INTERNAL MOTIVATION. A lovely lad, kind, polite, would help anyone but lacking a direction.
Well, the failure to get recognition in his high school exam must have pricked his self pride and given him a wake-up call. "So I'm not as wonderful as I thought I was..." This summer he knew he had to get into Medicine by competitive exam. HE'd chosen to do that and there was no Plan B.
Top 4% nationally and an immediate offer to his first choice of University.
I'm letting him draw his own conclusions...
Moral of the story: Your DS has to know what he wants and you will be more than willing to help him find it.