我本来知道答案，但考试时我什么都忘了。

I knew the answer, but I totally blanked during the test.

《牛津词典》

借口可以变得很具体：我知道我在看别人的考试卷子，但那不是作弊，因为我只是在检查我的答案，并不是在抄写。

Excuses can get very elaborate: I know I'm looking at another's exam, but that's not cheating because I'm just checking my answers, not copying.

youdao

任何一个曾经辛苦地经历过 SAT 考试的人都可以证实，应试技巧也很重要，即是否知道什么时候该猜测答案或者什么样的问题该跳过去。

Anyone who has toiled through SAT will testify that test-taking skill also matters, whether it's knowing when to guess or what questions to skip.

youdao

So also, along those lines in terms of test taking, make sure you also box your answers and that you keep track of significant figures and that you also remember to include your units.

另外，既然提到了答题要求，我想提醒大家考试的时候务必标出自己的答案,保持有效数字的一致性,并且记得带上单位。

麻省理工公开课 - 化学原理课程节选

There are also related reading materials quizzes exams problem sites, solution sites and so on.

还有相关阅读材料，小测,考试，提出问题网站，答案网站等。

麻省理工公开课 - 媒体、教育、市场课程节选

So, don't start here. And, it happens infrequently, but I've got to tell you, a few years back on the final exam, a couple of people were involved in passing information back and forth.

不要开始这样做，这也不常发生，我要告诉你们,几年前的期末考试里，有几个人，他们,给前后传递答案。

麻省理工公开课 - 固态化学导论课程节选