NCHMCT JEE

Yes, 12th is mandatory for NCHMCT JEE. The eligibility criteria for NCHM JEE is given below.
Eligibility criteria: 10+2 system of Senior Secondary examination or its equivalent with English as one of the subjects. Candidate must have passed English as a subject of study (core/elective/functional) in the qualifying examination. Those appearing in 10+2 or equivalent examination can also appear in NCHM JEE 2020 on provisional basis. Provisional admission will stand cancelled if proof of having passed the qualifying examination (10+2 or its equivalent) is not submitted at the time of counselling or at the time of admission or the latest by 30.09.2020.