I dont fink it can b that easy 4 all students depends how strikt the secondary skool iz, because my sis became Amrit Dhari in her teens (Well be4 her teens) she woz 12. & she went to Secondary School which was private she tries to cover her Kirpan by wearing it underneath clothes in Secondary but usualy would have it on the outside skool.
...well one day her skool had a uniform check or something and they saw the Kirpan pointing out of her blazer & basicaly they found out, but she resolved the issue by taking Amrit Dhari brothers and sisters to put across the viewpoint of how important it was to keep the Kirpan on @ all times and with the help of Guru Ji they agreed !