a) higher education in a study programme and study field focusing on chemistry, mining, metallurgy, mechanical engineering, civil engineering, electrical engineering, fire protection, food processing, medicine, veterinary medicine, pharmacy, natural sciences, agriculture or forestry, or b) further vocational education in a field of study focusing on chemistry, mining, metallurgy, mechanical engineering, civil engineering, fire protection, electrical engineering, health care, pharmacy, veterinary sciences, agriculture or forestry, or c) secondary education with a school-leaving examination in a field of study focusing on chemistry, mining, metallurgy, mechanical engineering, civil engineering, fire protection, electrical engineering, health care, pharmacy, veterinary sciences, agriculture or forestry, or d) a retraining certificate or other evidence of professional qualifications for the relevant work activities, issued by an establishment accredited in accordance with specific legislation, or by an establishment accredited by the Ministry of Education, Youth and Sports, or by a ministry in whose purview the sector in which the trade is operated falls, or e) documents under Section 7(5)(a), (b), (c), (d) or (e) of the Trade Licensing Act, or f) a professional qualification to pursue the vocation of chemist to operate devices pursuant to a special legal regulation