Please tell me the chapter wise marks distribution in physics, chemistry, and maths in boards...

To view the blue print, go through the following link.

http://cbse.nic.in/welcome.htm

There, click on the Examination (listed on the left column), then an interface will open on the same page. There, click on the Sample Question Paper for Board Exam 2012 (Class XII). Then, lastly click on the Science Stream to view the blue print.