what are the questions that might come for board exam and important points please

Dear Student,
All the questions are important from the examination point of view. Kindly go through the NCERT properly. All the best. 

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there is no important question in cbse so u should read full text[i.e]II term portions
 
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yes very well said.... just practice enough papers along with thoroughly revising and learning from ncert text.
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In Physics : (these are only which i know for sure)
1. Ray diagrams  (Any 1 ray diagram WILL come in the exam (as has been told by our teachers)
2 Any of the vision defects, i.e myopia or hypermetropia ( you'll have to make the diagrams )
3 Reasoning ques. learn all of them ( by that i mean, why stars twinkle? why is sky blue? etc etc. )
4 Numericals (quiet easy! ) 
And you should also check last years paper for more help. :D
For Bio and Chem, 
Yeah I have no idea :(  but i guess the physics part helped )
Oh, and learn the limitations of mendeleevs P.T . 
ALL THE BEST for your exams
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