Hi
I just wrote a gigantic post and it vanished so here's a summary-
DS is 17. First year at college. Did well in GCSE's - mainly 7-9's. Taken on 3 A Levels which are predicted to be A/B
One A level (Maths) is a real struggle. He achieved an 8 at GCSE. He's currently on track for a D/E.
He puts in minimal effort, the absolute basic. Would never not do homework, but it's rushed, and would rarely do anything additional to homework (practice papers etc) even though it's expected.
He enjoys the social side of college - his time table means most days only one 2 hour lesson. So lots of free "study" time - not for DS. That's time for socialising, sleeping and definitely not studying.
His teacher is frustrated. Says he's very rusty. Beginning of the year gave him the benefit of the doubt - 6 months away from studying due to Covid etc- except he hasn't improved.
His usage of time is pretty dire - for example gives himself entire school hols off even though he has homework and exams straight after. Weekends are for a good time too.
I feel there's a balance- it's not healthy to only focus on studies, socialising is important too, but he hasn't got a balance.
I don't like nagging. He's nearly an adult and I can't force him to work, but he knows I'm disappointed. When we talk about it he behaves crestfallen - like he's doing so much work and it isn't good enough for me.
He has high aspirations in life - wants to go to Uni, get a good job and earn lots of money. However his attitude to learning doesn't match that IMO
We've told him to come to us if he needs anything - equipment, nagging etc but there's nothing.
What do I do, or say? Just leave him to it? Have a go? I just know how disappointed he's going to be next summer 
Any advice would be greatly appreciated