It depends. It is not illegal to make up lessons during school holidays, because the country has no laws in this regard. However, the Education Bureau explicitly requires that all schools, except Grade Three, are not allowed to make up lessons during holidays, and schools implement the principle of "three wishes", that is, students' voluntary, parents' voluntary and teachers' voluntary. If senior three students don't want to make up lessons, they can directly explain to teachers and schools that they won't take part in making up lessons.
Legal objectivity:
Compulsory education law
Article 25
Schools shall not charge fees in violation of state regulations, and shall not seek benefits by selling goods and services to students or in disguised form.
Compulsory education law
second
The state implements a nine-year compulsory education system.
Compulsory education is a compulsory education for all school-age children and adolescents and a public welfare undertaking that the state must guarantee.
The implementation of compulsory education, free of tuition and fees.
The state establishes a mechanism to guarantee the funds for compulsory education to ensure the implementation of the compulsory education system.