句子主干 = 主谓宾:
Standardized tests + provide + a quick objective method of getting some kinds of information.
修饰成分:
1. about what a person learned, the skills he has developed, or the kind of person he is 为介词短语修饰information
2. what a person learned, the skills he has developed, or the kind of person he is 为介词bout的宾语,其中what a person learned 为宾语从句,he has developed 为省略关系词的定语从句修饰the skills, he is 为省略关系词的定语从句修饰