If the evidence had not been obtained at that time, it would be even more difficult to claim compensation now. It is recommended to claim compensation through the school first. When a school claims from an insurance company, it will generally take out school liability insurance. This is their responsibility. Generally speaking, schools will not shirk. The main reason is that you have been putting it off for a long time now, and there is no way to find some proof at that time. It is estimated that it will be settled through consultation.