Hi,

Following is the eligibility to apply for kvpy under SA and SX stream.

Stream SA-

• Students enrolled in XI Standard (Science Subjects) during the academic year 2020-21
• Obtained minimum of 75% (65% for SC/ST/PWD) marks in aggregate in MATHEMATICS and SCIENCE subjects in the X Standard Board examination

Stream SX-

• Students enrolled in XII Standard/ (+2) (Science subjects) during the academic year 2020–21
• minimum of 75% (65% for SC/ST/PWD) marks in aggregate in MATHEMATICS and SCIENCE subjects (Physics/Chemistry/ Biology) in the X Standard Board Examination during the academic year 2018-19

As you are in class 12th for the session 2020-2021 you should fill the form of stream SX.

Hope it helps.