[择校] 关注IB教育的看这个网站

To earn an IB Diploma, a candidate must study an additional language, though a second Language A1 may be taken in lieu of studying that language as a Group 2 subject
摘自http://en.wikipedia.org/wiki/IB_Group_2_subjects

Students who take two languages A1, or one language A1 and one language A2, are eligible to be awarded a bilingual IB Diploma
摘自http://en.wikipedia.org/wiki/IB_Group_1_subjects

其中对于A1、A2、B的描述为：
The Group 1 subjects of the IB Diploma Programme refer to the student's "Language A1," which is the student's native language or otherwise best language,
The Language A2 corresponds to a near-native level of fluency in the foreign language, and as such concentrates less on studying the actual language and more on the literature and culture of the countries where the language is spoken.
Language B is intended for students who have a previous background of 2–3 years in the language, and focuses more on learning to communicate in the language in written and spoken form.

请教下高人，当中文为A1时，英语选A1或A2相对B有很大含金量的区别吗？双语IBDP对录取的优势大不大？.