Can I enter Waigaoqiao Shipyard?

Waigaoqiao and you are not on speaking terms. They are shipbuilders, and you are the sailor. Even with a diploma, you can't do technical clerical work. You can only do on-site work. On-site work is mainly fitter, welder, etc. You only have a sailing certificate, but you don't have these skill certificates.

To sum up, your chances of entering Waigaoqiao are slim