In the United Kingdom, the immigration authorities will not provide the permission to enter the country or extend your existing visa unless you can show that you have the money to cover your course tuition fee and maintenance costs.Before making a visa application you will need a CAS (Confirmation of Acceptance of Study). In most of the cases before a CAS is issued, the University will look out or proof that you hold the necessary funds in the correct format required to make a successful Tier 4 visa application.