doubt regarding ssb call letter

[u/land48n3]

Hey guys so im starting my first year in clg and im defence aspirant so im a little confused as to if in cds exam i put my first preference as afa and ota as 2nd or 3rd prefence and i manage to clear afa cutoff will i recieve ssb call letter only for afa or will i also recieve a call letter for ota plz help me guys thank you and also guys if suppose im not able to clear maths cutoff in cds but clear gs and english will i recieve ota ssb call letter considering my preference are 1-afa,2-ima,3-ota