For open competitions in the Single Candidate Portal:  

You can modify your application form as long as the deadline for applications has not passed. Do not forget to validate your draft application again after making changes! 

Once the deadline for applications has passed, the application form cannot be modified anymore. This also applies to the choice of languages.  

Your CV can be modified anytime, but a snapshot of your CV will be added to your application automatically when you validate the application form.  

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.