Does KVPY assess students on only one subject that they select or all four- physics, chemistry , mathematics and biology?

@ shiwangi 
kvpy assess student on all 4 subjects , even if u will not take bio/ maths in 11^th also , the ques u have to face of 4 subjects , ( PCMB ) , 
and it donot also have a predefined syllabus for any stream , then  can ask any ques based on the respective level of students . 
so, u need to ready for that . 
ALL THE BEST ..