how to apply student visa in united kingdom

If you want to come to the UK in order to do a short course of study during your visit, you can apply to do so as a student visitor. The period when you intend to be in the UK must not exceed six months.
You must be aged 18 or over, and you must have been accepted on a course of study provided by:
an education provider that holds a sponsor licence under Tier 4 of the points-based system; or
an education provider that is accredited by an accrediation body approved by the UK Border Agency; or
an education provider that is inspected or audited by either the Quality Assurance Agency for Higher Education, Office for Standards in Education (Ofsted), Her Majesty's Inspectorate of Education in Scotland, Estyn in Wales, Northern Ireland's Education and Training Inspectorate or the Independent Schools Inspectorate; or
an overseas higher education institution that offers only part of its programmes in the UK, holds its own national accreditation, and offers programmes that are of an equivalent level to a UK degree.
During your visit, you must:
support and pay for accommodation for yourself and any dependants, without help from public funds; or
ensure that you and your dependants will be supported and accommodated by relatives or friends, and will not take employment.
You must leave the UK at the end of the visit you told us about, and you must be able to meet the cost of your return or onward journey.
You must not:
take employment in the UK (including part-time or full-time vacation employment);
engage in business, produce goods or provide services within the UK (including selling goods or services direct to members of the public);
study at a government-funded school;
undertake a work placement or internship (paid or unpaid) as part of your course of study;
extend your stay in the UK;
carry out the activities of a business visitor, a sports visitor or an entertainer visitor;
receive private medical treatment; or
be in transit to a country outside the common travel area (the UK, Ireland, the Isle of Man and the Channel Islands).