Test, Experiment, Exam
Noun and する verb
しけん
おっと！明日試験だっけ？忘れるところだったよ。
Oh! Is tomorrow examination day? I almost forgot about it.
何度か試験してみたんですが、まだ一度も成功してないんですよ。
We made several tests, but none of them have gone well yet.
「ところで、試験はどうだった？」「パパ、その話はやめてよ。」
"By the way, how was the exam?" "Stop talking about that, dad."
If you attempt a test, you're taking an examination. There are a lot of these in Japan, so make sure you know this word if you want to fit in with all the whining and whinging that students do, especially come the final year of high school.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.