Is there a formal way to say: pull your socks up?

[Nino]

English Idioms and Expressions, Advanced Level

ESL/EFL Test #32 "American Slang Words (6)", question 5

You've been very lazy this past semester. Now, you have to really pull your socks up if you want to graduate in June.

(a) work hard
(b) wear nice clothes
(c) be nice to the teachers

English Idioms and Expressions, Advanced Level

ESL/EFL Test #32 "American Slang Words (6)", answer 5

You've been very lazy this past semester. Now, you have to really work hard if you want to graduate in June.

Correct answer: (a) work hard
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Is there a formal way to say: pull your socks up?

Nino

[Mister Micawber]

.
'Work hard' is neutral; 'exert yourself' is formal. There are probably other ways to say this as well.
.
_________________
Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mr. Micawber