Hi Thomaas,
There are two important aspects of a study group:
- the discipline/rhythm
- the strength of the teachers
The Nordic Go Academy is tutored by 6-7d so that's all right. I would not settle and surely not pay for lower than 6d. So it remains for you to check the frequency of the lessons and the discipline. With discipline I mean that some online lessons tend to drift into lengthy discussions of ad hoc tactics by either teacher or other pupils. (Edit: it looks like the Nordic academy has a splendid offer and quite a heavy pace!)
In my opinion and experience, 6 kyu is an unreal barrier. It's a wall you may hit after a while of unguided playing. Anyone serious about Go doing the right thing will overcome that barrier in no time. Doing the right thing includes:
- play a lot and don't be afraid to invest some time in a game
- do tsumego
- get yourself some source of ideas
- analyze your games for what went wrong and whether the newly acquired ideas were applied
I'm only 2d so in fact you shouldn't listen to my advice at all, but still I'd recommend a few sources of very basic ideas which may have a strong impact on your rank and level:
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http://senseis.xmp.net/?DieterVerhofsta ... mesmanship (the things no one talks about, by me, 2d)
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http://senseis.xmp.net/?HaengMaTutorialForBeginners (by Minue, 6d)
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http://senseis.xmp.net/?BasicInstinct (by me and others, 2-5d)
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http://senseis.xmp.net/?OneTwoThree (by Charles Matthews, 4d)