Admission is open to all pupils irrespective of caste or creed.
As a rule, children are admitted to the LKG or to the Montessori I class. Admission to classes other than the Pre-Primary classes, Class I – IX, is restricted to students from the CBSE schools. The admissions will depend on the availability of seats and students will have to clear an entrance test.
Admissions to the Senior Secondary Section (Class XI) is made purely on the basis of merit, however, students of St.Antony's Public School are entitled to reasonable weightage in the admission process. All students who have passed the Secondary School Examination () are eligible for admission to class XI.
Application for registration does not guarantee admission as seats are limited. For admission to L.K.G or Montessori I, a child should be 4 years of age on 1st June of the school year in which admission is sought. For class I, the child must have completed 6 years of age on 31st May. A copy of Birth Certificate issued by the Registrar of Births and Deaths (Panchayathu/Municipality/Corporation) is compulsory at the time of admission to class I.