You will be required to provide:
- An authentic travel document or passport
- Evidence that you can support yourself financially whilst in the United Kingdom.
- Tuberculosis (TB) test if you are from a country whose citizens are required to take it.
- Certified translation of any document you have that is not in English Language or Welsh.
- Additional information and documents as it relates to your circumstance.
A more comprehensive explanation can be gotten from the Home Office website.