Pendang OCPD Deputy Supt Abdul Aziz Ahmad said nine were Form Five students while the rest were in Form Four.
DSP Abdul Aziz said the students would have their statements recorded in the investigation under Section 147 of the Penal Code for rioting.
On Sunday, a 13-year-old Form One student of the school told the press at his house in Gurun that he was beaten up by about 20 seniors at about midnight on Saturday until he had to crawl back to his dormitory.
He claimed that he had found a wallet at about 6.30pm on Friday on the school field and that he took the RM60 in it. Due to this, he was beaten up by the group of students.