Bearing in mind you age, you will be firmly under the EASA system:
FCL.025 Theoretical knowledge examinations for the issue of licences
(a) Responsibilities of the applicant
(1) Applicants shall take the entire set of examinations for a specific licence or rating under the responsibility of one Member State.
(2) Applicants shall only take the examination when recommended by 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 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 ATO, based on the needs of the applicant.