With the exception of the CAST Permanent (see more information about this selection procedure), once validated, you can no longer modify the content of your application, as EPSO will immediately process the data.
For CAST Permanent:
You can modify the content of your application(s) for the CAST Permanent selection procedure and upload or update your CV within your EPSO Account at any time.
Don’t forget to update your application(s) at least every six months if you wish to remain visible to the recruiting services. This applies regardless of whether you passed or failed the tests.