No, according to official website of Shenzhen Donghu Middle School, Class 3 of Donghu Middle School is not a key class, but an experimental class, and the key classes are classes 5 to 8. Shenzhen Donghu Middle School, founded in August 2000, is a public junior middle school in Luohu District. It is a newly-built high-quality school, a first-class school in Guangdong Province and an advanced education unit in Shenzhen.