When do we use "after" and when "until"?

[Zalu]

English Grammar Tests, Elementary Level

ESL/EFL Test #97 "Common English phrases with prepositions", question 2

Simon isn't at school this week. He's ......... vacation.

(a) in
(b) between
(c) on
(d) to

English Grammar Tests, Elementary Level

ESL/EFL Test #97 "Common English phrases with prepositions", answer 2

Simon isn't at school this week. He's on vacation.

Correct answer: (c) on

Your answer was: correct
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How would both after & until be used together in a sentence?

Zalu

[Mister Micawber]

.
I stayed after school until five o'clock.
.
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Native English teacher at Mister Micawber's