greetings,

Yes, in the SA stream papers, all questions are compulsory (both math and science) to attend. I am attaching an official link with more information regarding this so do check it out for your understanding:

http://kvpy.iisc.ernet.in/main/faq.htm#:~:text=What%20is%20the%20eligibility%20criteria,in%20the%20X%20Standard%20Board

check the point 6, especially.

good luck