Secondary vocational schools belong to primary and secondary schools, and the "Smart Primary and Secondary Schools" APP only has free course videos of ordinary junior high schools. Which APP or official website has a secondary vocational school? At present, there are relatively few online education resources in secondary vocational education, but you can try to find relevant free course videos on the following platforms:

China Vocational and Technical Education Online: This platform is an online education platform for vocational education headed by the Vocational Education Center of the Ministry of Education, which provides a large number of vocational skills training courses and resources, including courses related to secondary vocational education. You can log on to the platform to find the course resources you need.

Tang Xue Online: This platform is an online education platform hosted by Tsinghua University, which provides a large number of high-quality curriculum resources, including vocational education courses. You can search related course resources on this platform.

China large-scale open online courses: This platform is an online education platform sponsored by the Ministry of Education, which provides a large number of curriculum resources of universities and vocational education institutions, including courses related to secondary vocational education. You can search related course resources on this platform.

In addition, you can also try to contact local vocational education institutions or teachers to find out whether they provide relevant free course resources or online teaching services. I hope this information can help you.