How to pass the 12th board exam?

You should now focus on CUET Exams since they will help you get to a good university. Getting above 60% in class 12 Boards will be enough.

Take equal weightage to all subjects

Give some more time to your weak subject 

And always make a very short notes and revise them daily after sleeping

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Never target to pass.  Try to score more marks. Then you will pass automatically. Appy your will power.