Hello Rohit.

Here this website of CBSE will give you information regarding study materials for class 11th in CBSE. 

You can go through it to find the blue print of exams.

Http://cbseacademic.nic.in/publication_sqps.html

CBSE do not conduct a single science exam in 11th, rather physics, chemistry and biology have their own papers.

Hope this helps you

All the best