看老师能力，也要看班级氛围，主要是找到一群志趣相似的伙伴。
三次IMO金牌的德国妹子LISA SAUERMANN访谈时候就提到过这个，找出来看下：
I liked the math problems, but I also really enjoyed the social aspect very much. It was nice to take part in the competitions and to meet other kids who had my same interests.
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