"This is my lucky outfit," said the 18-year-old. "I bought it specifically for gaokao because Nike is my favourite sports brand and the shirt has a big check on it."

A high score in the exam, the culmination of 12 years in a notoriously stressful education system, is seen as opening the way to a prestigious university and a life of opportunity.

Foreign institutions are also getting into the act, with the University of New Hampshire this year wooing students with high exam scores for the first time.

Some Western clothing brands recognise the high stakes.

Nike is selling 299-yuan (34.7 pounds) T-shirts emblazoned on the back with the Chinese characters for "full marks" and the prerequisite swoosh on the front.

"I know that outfit by Nike, but I haven't seen it in the shopping mall," Lu said. "If I had seen it, I would have considered buying it."

Most students were in uniform outside five Beijing schools Reuters visited on Thursday, but many others, particularly male students, wore Nike T-shirts and sneakers.

Others favoured Champion, owned by HanesBrand Inc, or Supreme, a U.S. brand in which Carlyle Group has invested. Adidas and Hollister, owned by Abercrombie & Fitch, were also in the mix.

Red, a colour associated with good fortune in China, found favour among both students and parents.

An Weiling, 49, a teacher from Beijing Hepingjie No.1 Middle School, said all her colleagues were wearing red T-shirts.

Some mothers wore the traditional cheongsam, or qipao.

One mother, dressed in pink, said she would wear a different coloured outfit for each day of the exam.

"As the saying goes, unfurl one's flag and secure victory," she said, outside Beijing No. 161 Middle School. "On the second day I'll wear red, and on the third green."

The government expects 9.75 million students to do the exam this year, the largest number in eight years, most of them "millennium babies" born in 2000, the Chinese year of the dragon.

(Reporting by Ryan Woo; Additional reporting by Beijing Newsroom; Editing by Clarence Fernandez)

By Ryan Woo