2. After finding the storage place of the document, you can take out the registration card with your valid certificate. This is no problem as long as the documents are complete.
The address of the registration card needs to be modified in the school and/or the graduate office of Tianjin University, which is also relatively easy, no problem.
3. Accounts and documents don't need to be together. Now your account is still in school, and you can move at any time during the 2-year storage period.
Now you need to modify your registration card, then take your new registration card and household registration book to the school security office/police station where your household registration is located (if there is no place where you can accept your household registration, you can only go back to your hometown), and then go through the resettlement formalities with your registration card, migration card and household registration book with pins when you move out.