Section 5(1)(iv) in Bureau of Indian Standards (Recruitment to Laboratory Technical Posts) Regulations, 2019
(iv)the number of candidates to be called for skill test or practical test or trade test, which shall be qualifying in nature, shall be not more than four times the number of vacancies advertised in the respective disciplines or trades in the order of merit from among those who have secured at least fifty per cent marks in the written or online test in the concerned discipline or trade and also secured at least fifty per cent marks in the aggregate;