Any information about the document must be confirmed at school. It is built into the system itself. Fraud is possible if there is collusion with a school employee.
Fraud is possible in different stagers. That is why usualy scools double all the documents. They have a computer version of documents and paper version.
Usually? It must be a very corrupt country. I think that in most cases it is not possible to conspire at such a level to replace the data in the databases.
Many educational institutions are interested in the fact that their documents are not faked by fraudsters and did not sell on the black market. Therefore, they will not distort the information and upload incorrect data to the application.