dear rina

in NDA- there are 350 seats in total. 30 for the navy, 60 for the air force and 260 for the Army.

the seat of NDA is not fixed it varies according to the SSB and candidate.

yes, definitely the sports quota is available in NDA with the help of sports quota you may get a special opportunity for age relaxation, special reservation on selection etc.

the selection procedure of NDA is -

first written test

second SSB interview.

In SSB your first day go to a screening test

the second  day go to psychological test

the third day go to Group discussion round

the fourth day got to Interview round

the fifth day go to conference

after successfully completing these round you get selected in NDA.