basic skills and word problems. Open-ended problems were included on the math test until 2011, when they were removed to include more word problems. Students will then receive a letter stating if they have moved onto the interview phase. Interviews are conducted on an individual basis by teams of teachers and guidance counselors. Unlike the previous two stages, which are identical for every student, the interview may be personalized according to academy. For example, applicants for AVPA in the Music and Theatre concentrations present an audition, while applicants for the Visual Arts concentration of AVPA participate in an art workshop and present a portfolio. In 2021, BCA reported that they had a 15% acceptance rate. Extracurricular activities Clubs During the 2019–2020 school year, BCA had over 130 clubs. BCA has a Model United Nations team that runs its own Model UN conference for high school students, known as AMUN. The team also runs its own Model UN conference for middle school, known as JAMUN. The BCA Model UN team has won Best Delegation at numerous conferences, including those hosted by Yale University, Princeton University, the George Washington University, and New York University. The BCA Model UN team has also earned many individual delegate awards and is the largest club at the school. In 2008, BCA's math team won first place in Division B at the Princeton University Mathematics Competition, an annual competition attended routinely by the team. The school routinely has 10+ students qualifying for the USAMO (United States Mathematical Olympiad), with a student winning the competition in 2012. The school captured first place at the 2009 ARML Local competition, another routine annual competition. In 2015, student Ryan Alweiss competed on the American team at the International Math Olympiad, helping the United States win the competition for the first time since 1994 with a 98th percentile score of 31. BCA's junior varsity and varsity quiz bowl teams qualified to compete in the National History Bowl in 2013, and several individuals competed in the National History Bee. BCA had a battle BattleBots IQ team, known as the Titanium Knights. The team won the 2006 national heavyweight championship in the high school division with the robot E2V2, and won two other awards for another 120-pound robot, Knightrous. In previous years, the team has won second, third, and fourth place titles in BBIQ, and affiliated student teams have won numerous awards in Northeast