Hey there

No, BCA students can't give  KVPY examination. The students who are studying either in 11th class or 12th class or 1st year of UG  with basic Science can give exams for SA, SX & SB stream respectively. However the candidates need to score at least 75% marks in the aggregate (65% for reserved categories).

For more details you can click on the link below:

https://www.google.com/url?sa=t&source=web&rct=j&url=https://school.careers360.com/exams/kvpy/amp&ved=2ahUKEwiCjKmmvMLyAhULWX0KHdbOAQ8QFnoECAcQAQ&usg=AOvVaw27ipDMbz5HFg0WTjI7NipI&ampcf=1