(a)Holders of Categories I and II certificates under Article 3(2) of Implementing Regulation (EU) 2015/2067 are only allowed to continue using those certificates if they update their knowledge and skills to the level of the knowledge and skills required for Certificate A1 and A2 respectively, as referred to in Article 3(2), points (a) and (b), of this Regulation and specified in Annex I thereto.