<p>Trying to answer your questions to the best of my knowledge:</p>
<p>1) Roughly speaking, ‘AS’ and ‘A2’ are (externally-set) exams that UK students take respectively at the end of 12th and 13th grades (note that secondary school in Britain lasts one year longer than in the US, hence the “13th grade”). Your ‘AS’ and ‘A2’ grades (“marks”) are combined to produce an overall ‘A-Level’ letter grade (A, B, C, etc.), which is used by the universities for admission purposes.</p>
<p>2) In particular, a Cambridge applicant is expected to have at least 3 A-level certificates with triple ‘A’ grades in subjects that are directly relevant to his/her intended university major. Many successful Cambridge applicants however have up to 4 or even 5 A-level certificates.</p>
<p>3) The IB (International Baccalaureate) diploma is an alternative secondary school qualification pursued by many Oxbridge applicants who live outside the United Kingdom. The IB diploma requires passing international exams in six different subjects, three of which must be at the so-called “higher level” (i.e. advanced). Each subject test is awarded a score between 1 (lowest) and 7 (highest). In addition, students may get up to 3 extra bonus points for a compulsory extended essay and a compulsory theory of knowledge class.</p>
<p>4) Cambridge normally expects candidates applying on the basis of an IB credential to have a minimum total IB score around 40 points (out of the maximum 45) with grades at least 7-6-6 in 3 higher level subjects that are directly relevant to the candidate’s intended university major.</p>
<p>5) The standard American High School diploma and good SAT scores are not considered sufficient for Cambridge admission. US applicants who did not follow either a British A-level curriculum or an international IB curriculum must offer instead at least 3 Advanced Placement (AP) exams with grades 5-5-5, in 3 subjects that are directly relevant to the applicant’s intended university major. Note that 3 APs is pretty much the minimum number, but at least four or five AP exams with grades 4 or 5 will probably increase your chances of admission.</p>
<p>6) The interview is compulsory for all UK applicants and is mostly of a technical nature, i.e. more like an oral exam (see further info on Cambridge interviews [here](<a href=“http://mediaplayer.group.cam.ac.uk/component/option,com_mediadb/task,play/idstr,CU-Admissions-Interviews2005-Interview/vv,-2/Itemid,26”>http://mediaplayer.group.cam.ac.uk/component/option,com_mediadb/task,play/idstr,CU-Admissions-Interviews2005-Interview/vv,-2/Itemid,26</a>)).</p>
<p>7) Very few American students are admitted to Cambridge straight out of High School. The university is expensive for overseas (i.e. non-EU) students, but still less expensive than Harvard, Yale, or Princeton for example. The problem is that financial aid for foreign students is not normally available so, unless your family is wealthy, you may not be able to afford a Cambridge education as an American student.</p>
<p>8) Cambridge is normally regarded overseas as the world’s second best university after Harvard. The university is strong in mathematics, natural sciences (physics, chemistry, biology), engineering, economics, and humanities (English, history, classics, philosophy, etc.). You can also study medicine as an undergraduate subject at Cambridge (or most other UK universities for that matter), but the course lasts 6 years (including 3 years of clinical school). A 3-year undergraduate degree in law is also available, but an undergraduate law degree won’t be enough to allow you to practice law in the UK (or in the US for that matter). </p>
<p>9) BTW, most Cambridge undergraduate degrees may be obtained in 3 years. Exceptions are engineering, which is always a 4-year course at Cambridge, and medicine, which, as I said before, requires six years of study. Four-year courses are available also in mathematics and natural sciences; most students who want to pursue a PhD degree now choose the 4-year option over the older 3-year courses. The fact that most undergraduate courses last 3 years help to reduce the total cost of attending Cambridge when compared to US universities.</p>