NDA exam is conducted in 41 cities or towns all over India. There is a ceiling on the number of candidates allotted to each of the centres except Chennai, Dispur, Kolkata and Nagpur. Allotment of centres is on the first-apply-first-allot basis and once the capacity of a particular centre is attained, the same is frozen.
Applicants, who cannot get a centre of their choice due to ceiling, are required to choose a Centre from the remaining ones. You are advised to apply early so that you could get a Centre of your choice.