If you leave for special reasons, you can directly explain the situation to the local painting agency, and it is not a breach of contract after getting permission. So, you can rest assured, but you can't be absent from school for no reason.

Legal basis:

Article 465 of the Civil Code of People's Republic of China (PRC) * * * Contracts established according to law shall be protected by law. A legally established contract is legally binding only on the parties, except as otherwise provided by law.

Article 23 of the Civil Procedure Law of People's Republic of China (PRC) shall be under the jurisdiction of the people's court of the defendant's domicile or the place where the contract is performed.