Minnimum percentage 12 from cbse for appearing jee advance
For appearing in jee advance you have to score minimum 75% aggregate marks (that means in total ). You don't need to worry a lot about it .For good marks in boards you should strictly follow your ncert book it is quite helpful. To get acquainted with previous year question you should solve sample paper. There are many publication sample books are in the market. Bt personally I would suggest you for oswal.you should balance your both studies i.e for competition and for boards.
All the best for your exams
You should score atleast 75 or above it so that you could appear in jee and also be selected in good college as percentage of marks of boards are also estimated while allotment of college.
I hope this helps.
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