There is a great deal of support available to help you adjust to life in the UK. Colleges are familiar with the needs of overseas students and will normally be your first contact.
If you are interested in applying to study as an undergraduate or graduate at Cambridge, please take a look at the information available on the Cambridge Admissions Office web site (undergraduate) or the Graduate Admissions web site. These should provide the answers you need, and information on what to do next.
International Student Team
The International Student Team provides specialist support to students who come from outside the UK to study at Cambridge and to Cambridge students who study overseas as part of their course. They can help with information relating to visas, provide assistance if you are part of the Erasmus programme, enable access to funding information and briefings relating to living and studying in the UK.
The International Student Team also produces a useful booklet called 'International Students A-Z' which contains advice about everything from health to police registration.