In more general terms, I think I have always been v aware that education is a great privilege not a right - my parents came here as refugees, my dad's education was ended as a result and he had no opportunity to go to school/uni here at all. Eventually, in his 40's with 3 young kids he went to night school and did O Levels and law qualifications on top of a full-time job to get an education - I am just grateful that I have been able to get a great (and in my case, free) education. So I do impress on my kids how lucky they are to have the opportunities to study that they do, and that if they don't take those opportunities to the best of their ability then some doors will close, never again to be reopened. (Or bloody sight harder to reopen.) I suppose a classic first-generation immigrant immigrant mentality, really.
That's not to say that passing exams or getting As is the be-all and end-all because I don't think that either - lots of successful people didn't get an education or messed up their education. Force of personality counts for as much/more in reality. Certainly, the most successful people from my school in career terms haven't been the brightest or best qualified but those who were the most energetic and had the best shmoozing abilities.
What matters is that our kids are happy - getting an education does not = happiness. It can help one not to be in the automatic 'bin' pile for jobs, though. So others' suggestions of looking at possible jobs and entrance criteria is a good one. I've certainly taught students recently without the foggiest of what they might want to do and therefore no concept of what qualifications they need to secure now to allow that possibility to become a reality in the future, if they wanted to. It's no good denying that studying now is boring (well, for those not passionately into their subjects, which is the ideal situation, obviously) - compared to watching something good on the telly, say. But they need to understand that a few hours spent now will give them qualifications that will last a lifetime. There'll always be another crap tv show along. Maybe offer to video everything your dd wants to see, AF, and tell her she can watch them as soon as she's done her studying? Or if you're feeling v mean, once she's passed her actual exam (a huge tv marathon saved up for when the work is over?).
She will thank you for it - my dh often says he wishes his dps had made him knuckle down and advised him when he was younger. In his case, he did learn the hard way by failing stuff he should have passed, and has rectified it since - but much, much harder to do once you're also working and with kids etc. So he is v keen to keep an eye on the kids. For my part, I had no nagging at all (none needed, I was a swot :) ) so find the helicopter parent thing a bit alien... happy medium, hopefully...
AF - sorry, the phrase 'cry for help' just popped into my head. Could your dd be begging for firmer boundaries? Again, just a thought...
Sorry - long post, but it's a subject at the forefront of my mind due to discussions with my dh re dd. If anyone finds the ultimate one-size-fits-all answer, please let us know. :)