FCL.025 Theoretical knowledge examinations for the issue of licences and ratings
(a) Responsibilities of the applicant
(1) Applicants shall take the entire set of theoretical knowledge examinations for a specific licence or rating under the responsibility of the same Member State’s competent authority
(2) Applicants shall only take the theoretical knowledge examination when recommended by the declared training organisation (DTO) or the approved training organisation (ATO) responsible for their training, once they have completed the appropriate elements of the training course of theoretical knowledge instruction to a satisfactory standard.
(3) The recommendation by a DTO or an ATO shall be valid for 12 months. If the applicant has failed to attempt at least one theoretical knowledge examination paper within this period of validity, the need for further training shall be determined by the DTO or the ATO, based on the needs of the applicant.
I think that answers your question.
Ground Exams will probably go online sometime in October, to be able to invigilate them you will probably need to be a Ground Examiner in accordance with
Standards Doc 11