I'm an archivist, and I can tell you clearly that files can't be supplemented, and it's useless to supplement materials, but now many units don't pay much attention to files unless they are civil servants of state-owned enterprises or government agencies.

But if you want to make up (preferably), you can start from the following aspects:

1, when you return to the university where you graduated, you should fill in the graduate registration form, statements, materials for joining the Party (party member had better write some application forms for joining the Party himself), physical examination forms of schools and hospitals, and the most important proof of dispatch. As for the school year appraisal form, forget it if you can't fill it out. Anyway, do your best.

2, high school files, this is very difficult,

3, ingenious files, that is, these things you filled in when you were in college, are more difficult and basically impossible.

4. Off-duty files, regular employment plans, cadre resumes, salary files, etc.

The most important thing is the university files, and the work files are easy to supplement. Forget it if the high school file can't be made up.