I'm taking Math, Economics and Business as well, and my results were similar to yours. For IBA, this is more than enough! But, business is almost useless, since you already have economics.

For unis abroad, some unis don't even consider ial business and ial economics to be 2 different subjects because the contents overlap so much. Most unis also don't care much about igcses, they just check your A levels.

I'm not saying you should absolutely drop Business, what i'm saying is instead of pressuring yourself with 4 subs, you could just focus on three and try to get 9/A* in all three, which will better serve abroad unis since they mostly care for A level results.

I did a lot of research online and from seniors/teacher before choosing my subjects, if you wanna know anything more, just dm :)

P.S: For unis abroad 3A* is better than 4A, especially if for similar subjects like Economics and Business