Hello there!
I'm new to the site so I hope I don't embarrass myself by doing something wrong. 
I have inquiries regarding the IB program vs. A levels. My family and I are currently living in the states. My DD16 is currently doing "pre-IB classes" at her American high school (Year 10, 11 and sixth form) to start the IB next year in her "Junior" year (Year 12).
However, we're looking to move back to the UK for her sixth form.
She'd like to continue with the IB, but I'm concerned that it would be more difficult to gain admission to the school she's interested in. I've read that the requirements for IB tend to be higher than for A levels. She is an "A" student and will be likely looking at top schools.
I'm curious whether my worry is deserving or whether universities' high level of expectation for IB is true.
If this is true, would it be worth starting A levels next year or just continuing with the IB? She is accelerated a fair bit in math and is currently completing the first year of IB Math. Would she easily transition into A level maths of some sort? She is also only enrolled in her second year of German due to the weird American IB system.
However, I don't think she'd continue with German to A level.
Basically, I'd appreciate advice on which system to chose as well as suggested readings on the A level system which has changed a fair bit since when I went to school. ;)
Thanks!