I haven't paid my membership dues for five years. Have I been removed from the list long ago?

It stands to reason that if you don't pay the membership fee for half a year, you will automatically leave the party membership.

At present, when graduating, ordinary schools will require students to transfer their party member relationship, to the place where files are kept, or to the enterprise they serve.

nowadays, many of them are flexible, and they strictly follow party constitution's rules, regardless of what party constitution stipulates.

I suggest you contact the school and tell them about your situation. Some enthusiastic people will help you be as accommodating and flexible as possible.