In the Know

Snapchat 最近在全国公路用广告牌做的广告上，除了自己的标识以外，什么都没放，令不了解内情的人好奇或困惑。
People have encountered Snapchat's billboards with no text, just its logo along roads nationwide, leaving those not in the know curious or confused.



People in the know: people who have more information or knowledge about something than most other people.  对某事比大部分其他人了解内情或有知识的人。

all-or-nothing

今天看到洛杉矶时报是这样描述国内的高考的 －
gaokao - China's all-or-nothing college entrance exam

在琢磨怎么译比较贴切，“全有或全无”吗？
高考，考好了，什么都全有；考砸了，什么都没有。