To resit an exam is to take it again, usually because you failed or your mark was not high enough.

To resit an exam重考一科考試 to take it again就是再考一次 usually because通常是因為 you failed你不及格 or或 your mark was not high enough分數不夠高

British and some other school systems use it; American English prefers retake. As a noun: I’ve got a resit in June.

British and some other school systems英國和其他一些學校制度 use it會用這個字 American English美式英文 prefers比較常用 retake重考（這個說法） As a noun當名詞用 I've got我有 a resit一次補考 in June在六月

Though actually, sit here is the British verb for taking an exam (“sit an exam”), so resit is literally “sit again.” It is ordinary in UK university emails, a bit foreign in US ones.

Though actually不過其實 sit here這裡的sit is是 the British verb for taking an exam英式英文裡表示「考試」的動詞 ("sit an exam")（用法是"sit an exam"） so resit所以resit is literally就是字面上的 "sit again"「再考一次」 It is這個說法 in UK university emails在英國大學的email裡 ordinary很常見 a bit foreign有點陌生 in US ones在美國的email裡

It is not reset (to put a machine back to the start), and it is not a casual word for studying the chapter one more time — you resit the test itself.

It is它 not reset不是reset (to put a machine back to the start)（把機器恢復到原始狀態） and也 it is not它不是 a casual word for studying the chapter one more time隨便說「再讀一次那一章」的字 you resit你重考的是 the test itself考試本身

In Taiwan classrooms you will hear 重考 more often than this English word.

In Taiwan classrooms在台灣的教室裡 you will hear你比較常聽到 重考「重考」 more often than而不是 this English word這個英文字