Well i can’t say i’ve raised any teenagers in my day, but i’m not too far out of them to not remember them.
As for the grades, (please forgive the overarching statement) I’ve noticed that intelligent males get lazy with the general mentality of "I know i can Ace this, They know i can Ace this, so why bother putting the effort in when i could be playing video games (or some other distraction)
As for the sports team, i hate to sound efternoon special but he could be getting picked on by the team. Teenagers are just as spiteful as children but more intelligent about it. If he is inteligent “jocks” will see him as a threat and try to make him feel less than he is, because “jocks” need to be number One so they fix the inteligence problem by destroying self esteem and getting the kid to leave the team.
If he enjoys it and is have problems with team mates then he may leave it all the faster as he may not want something as special as that to be tainted in his opinion.
The one thing i can say for certain is don’t just ignore it. Ask questions but phrase and tone them in such away that you are not prying or critising just being concerned and observant.
Let them feel that you are still watching after them but not “watching” them. It may mean more to them than you may know just to know you spotted the difference.
If things get worse if grades slip further, sit down and talk with them like an adult. Let them understand that even though they may be having problems your not going to treat them like a child again.
let them know that if their having a problem you can trust them to either figure it out, or be mature enough to know when to ask for help. If you can get this across and they DO need help they will ask.
These are all things my mother did for me, she talked to me like an adult and treated me like an adult and if the situation called for it kicked me in the butt like an adult. Teens are stubburn, males even more so and even the best and brightest need to have it pointed out that they’re being bone headed.
Trust me i wasn’t the easiest sun. I had two older sisters so my mother had the experiance but i was able to try her patience alot. At some point she decided that i was going to make my own decisions no matter what she told me to do. (i’ve seen a lot of parents get very confortational over these things)
She stopped telling me what to do and started discussing things, pointing things out from her own experiance or those she’s seen, just like you might do with a friend, give advise point out possible trouble and trust them to make the decision, and be there to help pick up the pieces if neccesary.
And because she put this trust in me /I/ expected me to make mature decisions because obviously if she trusted me to then i could. at that point i realized i knew jack about a lot and i would frequently go to her for advise. Having adult…ish… conversations and discussions about anything.
I hope this helps some.