I think you may be being swayed by your school's obsession with really high grades for maths mmzz! A level economics isn't very maths heavy at all, or else it would be maths-lite, not evonomics! You need to be comfortable manipulating figures & bunging numbers into equations and calculating percentages. It's a really enjoyable subject at A level, because it talks about the real world and explains how things like monopolies, pricing, inflation & the balance of trade work. You only really need A level maths to do economics at degree level. Only around 50% of 18 year olds go to university full stop, let alone go to Oxbridge, so A levels are accessible to a lot more than the high flyers. A grade 5 at maths is still a good grade, even if it is "just" at foundation level.