On which chapters i have to concentrate more than others for all subjects??

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@ pallavi 
for physics , concentrate more on mechanics as far as jee syllabus is concerned , and as far as 12^th board syllabus is concerned , then focus with optics part of class 12^th , 
and in chemi all the 3 sections are imp . 
and in maths – complex number – vvimp chap . 
then u need to clear about trigo , limit derivative , integrals , deiffrential equation etc . 
KINDLY SPECIFY FOR WHICH EXAM U ARE PREPARING FOR . 
THEN I CAN GIVE U THE MEANINGFULL HELP 
ALL THE BEST ..