You must keep a cool head during the test.
keep a cool head
idiomTo keep one's cool; to stay calm.
When the fire alarm rang, the manager managed to keep a cool head and led everyone to safety.
Despite the mounting pressure and the chaotic nature of the negotiations, the diplomat managed to keep a cool head, ensuring a peaceful resolution was reached.
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bang one's head against a brick wall
To waste effort on a futile project.
- 02
bash someone's head
To beat up someone violently.
- 03
big head
An inflated ego, an exaggerated belief in one's own importance.
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bite someone's head off
To severely berate someone.
- 05
blow someone's head off
To shoot someone in the head.
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bury one's head in the sand
To deliberately ignore the reality of a situation; to pretend a problem does not exist.
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cobbler, keep to your last
One should not criticise matters outside one's field of expertise; one should mind one's business.
- 08
come to a head
To rapidly reach a turning point or climax.