Hello Aspirant,
The eligibility criteria for NCHMCT JEE exam is completion of 10+2 i. e. you need to complete your 12th grade, after then you can give your NCHMCT JEE exam. As you complete your 12th in 2023 you can give your exam in that year, you cannot give the exam while studying 12th.
Hope this helps you, Good Luck, Thank You :)
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