I would just like to defend Wycombe Abbey. DD is very happy there. She is an exception in that she comes home briefly most weekends (we love to see her and she is) but she loves the school. The extracurricular activities are fantastic with high levels of sport, music, drama and lots of clubs.
She has occasional periods when she works hard but this is balanced with more quiet periods. I think a key thing is that she never was tutored and the school was amazing in guiding her and supporting her (essay writing was nothing she really had done before going there).
The girls we see struggle were tutored, sometimes heavily, before coming to the school. To suddenly maintain a high level of academics, independently and access and process the learning on your own when you are used to someone explaining it 1:1 is hard.
It is also hard if you worry a lot or if you are used to always doing amazingly. DD started to do revision notes the first year, they didn’t really work and some first (and in some cases second) exams went much less well than she thought. She got cross, had some chocolate and kept refining her revision note technique. Now she has it down to a T.
There are also many outstanding girls there so you cannot be easily intimidated. Some girls are music grade 8 aged 11 (orchestras are brilliant). Some girls do a very high level of sports outside of school. Some girls are academically off the chart. You need to be able to compete against yourself (chances are someone will always be better than you), take people for what they are, find some friends to study with, help each other and be able to relax with Netflix and popcorn.
For the right girl it is an amazing school and we have found pastoral care excellent (although we have only really needed it for illness and trying to convince DD to cut down at least one of her about 10 extracurricular clubs).
If you have a confident girl who can navigate the above, I really don’t think you need to worry at all. If you have an easily intimidated girl, a girl who is used to tutoring or a girl who is easily stressed, you may want to look a bit at other schools as well and investigate what really would make your child the happiest.