Dear Sagar
It depends but if you are able to solve some papers and also model questions from Arihant series.  The there is  definitely Cagney to get.  But don't try to get only 150 because it's not possible once so I want to say that target for 200 so that definitely you will get more than 150.
Comment here,  if you want more information.
All the best.

Hello sagar,
From my personal experience I can tell you that if you do the NCERT along with the proper concepts mentioned in the NCERT then you would be able to score at least up to 140 to 150 marks in the Chi means but it would be better if you practice along the previous year papers of the JEE mains of the recent 10 years.

No bro ncert(11th+12th) should be good for chemistry on the point of view for jee mains.you should do selected chapters of high weightage of physics and mathematics. For scoring around 150.

No it is a national level exam it requied more study than you write in question

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