You'll need to keep a clear head for your interview.

你面试时需要保持清醒的头脑。

《牛津词典》

Always keep a clear head!

时刻保持清醒的头脑！

youdao

To live in the present moment, but keep a clear head.

活在当下，但要保持清醒的头脑。

youdao

"I had to learn to take my time in judo, and I was just able to keep a clear head, " said Rousey, who became the first American woman to win an Olympic judo medal in Beijing.

NPR: Ronda Rousey Wins Historic Women's UFC Debut

These are some of the other things that go sailing through my head as I strain to keep the car between the lines: Leaving the desert on a clear day.

NEWYORKER: Indianapolis (Highway 74)