Hello Aspirant,
Hope you are doing well. As per your query you have to do both 11th and 12th from PCM because Jee mains is a national level examination where they ask the syllabus of 11th and 12th both . You cannot prepare only the course of 12th class , you will also have to prepare the 11th class syllabus to clear the exam.
Hope it helps.
Good luck :-)

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