Imperial College London is a public research university located in London, United Kingdom, which specializes in science, engineering, medicine and business. Imperial is amongst the most selective universities in the UK. The overall acceptance rate to degree programs has consistently been below 20 percent and in 2009, the acceptance rate for postgraduates was 19.5 percent and 15.3 percent for undergraduates. Along with University College London and the University of Cambridge, Imperial was one of the first universities in the UK to make use of the A* grade at A Level for admissions, with engineering and physics courses requiring an A* in Mathematics. Imperial announced in 2008 that it was exploring the possibility of entrance exams to help it select the most suitable students. Since then, Imperial has been reviewing and piloting a range of approaches, such as subject-specific tests, skill tests and motivation-based tests as part of enhanced interviews. For the 2007–08 academic year, Imperial had a total full-time student body of 12,319, consisting of 8,741 undergraduate students and 3,578 postgraduates. In addition, there were 1,036 postgraduate part-time students and 39 of all full-time students come from outside the European Union.