不光是providing 和to train 不平行的问题，主要问题是where引导的定语从句没有主语！！！所以这句话最好不要用定语从句。 The school is a place not only providing textbook knowledge but also traing them how to builid self-confidence and self-esteem, both of which are good qualities of valuable members.用现在分词做修饰成分，既简洁又正式，而且前后平行。
the school is a place where not only provides textbook knowledge but also train students to build up self-confidence and self-esteem, both of which are good qualities of valuable members.
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