Tier 4 Child Visa application Similar to the Tier 4 General visa, which is for adult students, Tier 4 Child visa applications are for children under 18 years of age. In order for the visa to be successful, applicants will need to show that they or their parents support them financially and that they have an offer for a Tier 4 licensed educational institution. Tier 4 Child students will need to show that they have obtained 30 points by obtaining a Certificate of Acceptance to Study (CAS) number.