The reason? Tongxin School has no central heating to keep its students warm after a new ban on coal heating kicked in late last year.
Lead researcher Fang Lai with Stanford University's Rural Education Action Programme explains that the academic performance of migrant students worsens the longer they live in Beijing and attend migrant schools because of such handicaps. "Our analysis shows that migrant students who attend even the worst-performing Beijing public schools significantly outperform students in migrant schools," he said.
GLACIAL PACE OF REFORMS
The central government is deeply aware of the risks the next generation of undereducated migrant children would pose to China's prosperity - and social stability.
In 2016, it announced a plan to issue urban hukou documents to 100 million rural-registered Chinese living in the cities by 2020, a target it is on track to hit. It has also taken on board some of the common-sense solutions prescribed by the blue book, such as allowing more migrant children to sit the gaokao, or national college entrance exam, in the cities they reside in. But local resistance is holding up the reforms.
While a handful of provinces, such as Guangdong, have relaxed restrictions on public school enrolment and gaokao eligibility, others like Beijing have tightened theirs in recent years, showing up the limits of central government edicts on municipal policies.
"Local governments have discretion when it comes to implementing national education policy, and many rationalise exclusion with reasons like costs of financing,impact on the quality of local public schools, limited educational spaces and resources, and last but not least the protection of urban citizens' privileged access to top-quality schools," said Mr Mao Ding, an education researcher at McGill University.
Even if reforms are implemented overnight to give migrant children the same access to quality education as their city-born peers, another deep-seated problem still remains: unequal access to its best universities.
Many of China's top universities, such as Tsinghua and Fudan, are located in Beijing and Shanghai, which reserve a significant number of spots for locally born students and impose quotas - and higher cut-off scores - for students from other provinces.
Peking University and Tsinghua University, for instance, together take in about 84 out of every 10,000 Beijing students who take the gaokao each year, but just three out of every 10,000 candidates from Henan. An attempt in 2016 by the Ministry of Education to get leading universities to admit more students from poorer provinces was met with protests in more than two dozen cities, and the plan was aborted.
Provinces like Henan long ago adapted by creating highly demanding education systems that are in many ways more rigorous than in Beijing, said Mr Chen Jianguo, Yuyang's father.
This is why Henan consistently ranks second, after the capital, in terms of the number of students it sends to both Peking and Tsinghua.
But this creates another set of problems for migrant students, who often return to their hometowns for high school and to take the gaokao. Having attended poorly resourced migrant schools in the cities, most have difficulty adapting to the more intensive school system back home, said Mr Chen.
With the Beijing authorities intensifying a campaign to reduce the number of migrants in the city following a deadly fire in Daxing district last November, Mr Chen and Ms Fang are considering returning home for good.
"In 2008 it was 'Beijing welcomes you', but in 2018 the city doesn't really want us here any more," said Ms Fang.
"Going back to Hebei might not be so bad. It will be much easier to take care of my parents, while also keeping an eye on my son's studies."