The Tier 4 visa is a student visa for the United Kingdom.
The visa enables international students to arrive in the UK in order to take advantage of the educational opportunities in the country.
This student visa caters to international students that aspire to study in a full-time degree-level course at an eligible educational institution in the UK.
The visa will allow you to arrive in the UK for up to 1 week before the start of your course. This is in case your course lasts 6 months or less.
Apart from this, the visa will allow you to land in the UK 1 month before if your course starts your course lasts more than 6 months.