I recently graduated with a 1st in my undergrad (sport management, Solent University). I want to switch to studying something more challenging and more academic for my Masters (most likely economics, even if this means taking an additional diploma or doing a 2 year Masters), and I want to apply for a top university (looking at LSE, Cambridge, etc.). However, these economics postgrad courses all ask for some sort of quantitative academic background as a prerequisite, which I don't have (school bored me as a kid, and I never took it seriously — I only just scraped into Solent with a couple of BTECs and a personal training qualification from college).
I was always academically gifted and I'm confident I would be able to pick up the content of the course fairly quickly despite the gaps in my education, but, of course, it's difficult for me to prove this without the credentials, and I understand why they would be hesitant to take a chance on me. If I were to take a GRE test and score well on the quantitative section, would this be an adequate substitute for my lack of a mathematical background? Or should I perhaps look at taking a one-year maths diploma from The Open University (or something similar)?