is it necesssary that for preparing for 12 boards in one month ncert of class 11 should be revised thoroughly

It entirely depends on u capability and confident,

If u r preparing for some competitive exmas like iit/nit, u must be knowing all the topics be it 11th or 12th board as u'll be giving these exams in less than 2 months.

If u r not, plzz revise everything and make u r concepts clear

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regards

Ramesh