Hi Maverick, I am much older now, but at age 6 I was way ahead for my age, so I was promoted up a class so I was a year ahead and by far the youngest in that class, but still I came first in my class of 35 in every exam up until age 11 when I went to grammar school. A few people hated me, but we weren't required to do group work.
For various reasons (life always has strange twists) I did not go to uni, I went into a job. I had the same problems, people didn't have faith in me, and some were annoyed when I wanted to go out and do a days hard work. I began to show them up as being lazy and I took a lot of stick for it. I guess I was 18 or 19 at the time. At age 21 I was the youngest person to qualify in my country for a legal and technical exam with a 20% first time pass rate, and I appeared in the local newspaper.
Your education system is probably different to the UK and there is not much group work here, or at least there was not in my time. I guess they are trying to promote "team building" and all that BS (yes?). But actually there are problems when you put people of mixed ability together to to a job. I think it is to do with our system, where people have to compete against each other to get on. I guess your classmates see you that way because maybe they are a litte afraid of you because they are worried that you will outshine them? Also they are probably younger, and, well, are just kids.
I guess the answer is to learn diplomacy. There are ways you can change someones work and make out that it was their idea. For example, phone them, put the idea into their head, make it sound really good, then tell them you agree and think it's a great idea, "would you like me to try and rewrite it?" and so on.
Also do you have any kind of mentor? When I did eventually do a degree as a mature student, I had some problems and went to see one, to my surprise she said "Oh yeah, lots of mature students say that". And I thought I was the only one!! Any mentoring service may be able to deal with the issues for your particular circumstances in the best possible way.
For info, I did join British Mensa and there were lots of articles in their magazine about how people who are way ahead of others often go off track and become under achievers because they get bored, and so on. Don't do that yourself. Get bored I mean. Stay a Maverick :) Anyway apart from that info I did not get much out of Mensa. I merely used it as leverage to do a degree as a mature student. It served its purpose.
Now from another angle, I recall a colleague who I used to work with. He did a degree in Economics. He told us a story of how when he started his degree, everyone was asked to say a little about themselves, and what they wanted to get out of the course. You know the stuff. Everyone said something that sounded impressive. When it got to his turn, he said "My name is XXXXX, and I live in London, and I want to get 51 percent". Lol! I guess he was probably older than the other students too!
But in actual fact he was quite materialistic and selfish, and I don't think you are, in fact I suspect far from it. So for you I think a bit of diplomacy, maybe speak to someone to discuss (but I guess you have done that here). You already fully understand the problem, which is half the battle.
Good luck.
Give them a choice. If you come across something that does not have enough sources cited or missed the mark, has spelling errors, etc, talk to the person responsible letting them know what is wrong with the piece and ask them 'if they have time to fix it or would you rather I do it?' Since you have a stake in the grade there is nothing wrong with wanting to turn in the best work you can. Since they were lazy about the assignment to begin with they will no doubt opt out of doing any more work on it and you can blissfully do your thing.
As far as not wanting to get stuck doing the majority of the work, you will no matter where you go, as work ethic is sorely lacking in many and if you have a good one you will always table more than your share. Part of life. This is why so many 'mavericks' work for themselves.