Universities see A level business and economics to have overlap, so you may struggle to get an offer. Also, none of your subjects besides maths are considered facilitating.
Even if you're 100% set on dropping maths, just get the AS qualification first I'd say as it would help with university admissions, even if you don't finish the whole A-level. Also even if continuing to study it harms your other AS levels, it won't matter as it won't count towards your final A level grades in those subjects. You'll have time over the summer to sharpen up on the other three subjects.