id really recommend taking A level Business. I got an A* in it and although no A level is easy, it was pretty straight forward and largely common sense/ memorisation and I didn't find it too hard. There are a few calculations in it and formulas to learn but just keep doing past papers and it gets better. i've seen a lot of people struggling with further maths so if its not required by your course I wouldn't really recommend doing it if you're taking maths anyway.