I dont know about the american/uk system, it might be better there. I went to the international line in europe and it was a complete disharmony between how the teachers thought they should teach and what kind of teaching IB required. Theres also a lot of shady stuff with IB, like you can basically pay for an expensive tutor and completely coincidentally they will teach you the exact right knowledge to get a good score on the exams. The problem with this is that if the exams dont have a certain subject in them that year, the tutor wont teach that. Basically if you want your kid to be a successfull businessman or whatever, and you have a lot of money, 100% send em to IB, but if you want them to think for themselves, theres very probably a better option. Once again this mainly applies to my experiences in europe, there are many countries here where IB is a joke, like in hungary nobody goes there cause you have to pay, get worse education, and dont really have any oppurtunities going forward with it. Id say go ask other people but some of them will be absolute IB shills for no reason, and others will say its the antichrist itself. Also from what i understand, you do have to pay for education in uk to get somewhere right? Then id guess IB isnt that bad cause youre paying either way for school.