Sign me up! I have twins going into yr 11 next week
Like @Isentthesignal our twins are very competitive, only with each other, not other kids. It makes life difficult when reports and grades come out - I'm already dreading results day.
Both have high expectations of themselves and will feel as though they have failed if they don't achieve all 9s (absurd!) I try to talk sense into them but they're not receptive 
Both want to do mainly sciences and maths for A Level. Neither is keen to change schools for 6th form, even though they think their school is v competitive and bad in general at dealing with mental health issues (I try to ask in what way could school improve, or do they think it's better in other schools but they don't respond...)
Tbf, the school is a highly selective grammar, but I'd be surprised if teenage girls in other schools were all 100% fine and happy.
Mine will also carry on with extra curricular music activities, I'm hoping they'll continue to see it as fun rather than additional stress. They're taking music exams in the autumn, GCSE mocks are in January.