Hello Fidha....

To study in uk international students have to acquire a student visa from the near by british high comission,a tier 4 student visa will cover a student plan to pursue full time education in uk..

.you can apply for a student visa 3 months prior to your date of travel to uk,before applying you must prepare the supporting documents that will need...........

EVIDANCE OF CPONFIRMATION OF ACCEPTANCE FOR STUDIES

ASSESSMENT BASED ON QUALIFICATION

ASSESSMENT BASED O REFERENCES

ASSESSMENT BASED ON PROGRESS

ASSESSMENT OF ENGLISH LANGUAGE COMPETENCE

EVIDENCE OF FUNDS

You should apply for ATAS clearance certificate online on the foregin and commonwealth office website,which also contains information about the scheme and list of subjects.

additional requirement for financial sponsorship is also needed.

also you can read the uk visa procedure tests and examinations ,payment of application fee 

to understand the complete process involved in it you can check through

www.ukba.homeoffice.gov.uk

  or 

www.hyderabadoverseas.com

All the best

Thank you