blue book
noun [ C ] US uk/ˌbluː ˈbʊk/ us/ˈbluː ˌbʊk/
（美国大学生考试用的）蓝皮答题本
a booklet (= number of pieces of paper fastened together with a paper cover) with nothing on the pages, that college students in the US must use to write their answers to exam questions
You pretty much just had to write your name on your blue book and you passed. 你差不多只需要在蓝皮本上写上名字就通过考试了。