-I'm currently doing A2 chemistry and I can say that yes, it is hard, but Chemistry is a highly valued subject.
That's not to say that Business isn't valued, but Chemistry is rightly or wrongly seen as a more challenging and more academic subject than Business.
It all depends on where you want to be in a few years time: if you want to go for any kind of STEM or an academic career then Chemistry will be more beneficial to you in the long run.
Kind regards,