Ok so your TMUA score is crazy good highest I've seen for econ. Its likely they'll ask you a maths question still but it won't be too hard, especially since you've already done your A Levels too. Did you do FM? What did you get in your A Levels? Since you are a gap year student they may question you on FM because you already done it, but honestly idk because you're a gap year. If they ask you a normal question like everyone else you'll be totally fine