1. Complain to the educational institution: you can complain to the principal or management department of the institution. Explain the problem in detail by telephone, email or face-to-face communication, and ask them to take corresponding measures to solve it.

2. Complain to the local education administrative department: you can complain to the local education bureau or the education commission and other administrative departments. Provide detailed evidence and explanations and ask them to investigate and mediate.

3. Complain to the consumer association: If the problem involves service quality and consumer rights, you can complain to the local consumer association. The consumer association will investigate the problem and take corresponding measures.

4. Complain to the market supervision department: If the problem involves illegal activities, you can complain to the local market supervision department. Provide relevant evidence and explanations and ask them to investigate and deal with it.

Preparation for lodging a complaint against an educational institution:

1. Collecting evidence: Before filing a complaint, you need to collect evidence related to educational institutions, including contracts, invoices, emails, chat records, etc. These evidences can prove the transaction or communication between you and educational institutions, which is helpful for the follow-up complaint handling.

2. Understand the complaint channels: choose appropriate complaint channels, such as telephone, email, face-to-face communication, etc. You need to know the advantages and disadvantages and operation processes of different channels in advance in order to choose the method that suits you best.

3. Deal with the problem rationally: In the process of complaining, you need to remain calm and rational, and don't use insulting language or threats. At the same time, we need to clearly express our own problems and requirements in order to solve the problems better.

4. Keep relevant evidence: During the complaint process, you need to keep relevant evidence, such as telephone recording and email. These evidences can prove that you filed a complaint and help you defend your rights in the future.

5. Seek professional help: If you are not satisfied with the result of complaint handling, you can consider seeking professional help, such as lawyers or consumer associations. These institutions can provide you with relevant legal advice and rights protection support.