Do we have to continue serving Ca firm after Final exams ?plz clarify

my final is due on nov 2021. my query is if i take 6 months leave for final then do i need to serve for that extra 6months after finals or only balance peroid ?. Does 3years articleship include leave taken for final exam ? or need to serve equal to leave taken for final.
After Nov 2021 final do i need to serve 6 months or 1 year ( as i start articleship from april 2019)?? plz clarify my doubt