Urgent: plz helpp

Can anybody please tell me where in CS documents I can find the word "POSTAL" , bcoz without it CA institute is not registering me for articleship.

Explaination: I applied for Registration in articleship with Form102 (CS Exec), but now i am unable to prove that I'm doing CS Exec. via POSTAL Scheme and not through Oral coachings. Help in the matter will deeply appreciated.

A Pre-Thanks to the repliers.