Any tips for an upcoming year 12?

I’m going into year 12 and I’m aspiring for a Russel group university. Does anyone have any recommendations for what I should do to prepare myself for university such as supercurriculars or extracurricular activies?

Hii! What course do you want to study? There's usually suggested supercurriculars in the universities' websites, and they have really good reading lists on the Cambridge and Oxford! About extracurriculars, only if they have very clear transferrable skills, but if you can get your extracurriculars to count as supercurriculars (subject related).
Also, get started on UCAS as soon as possible and study for any admissions tests if you have them and just study in general, but also leave some time for yourself hehe
Best of luck!

Preferably something in Finance/Econ

you should join a debating class or smth cause they have national championships, finance and econ unis eat ts up. also maybe enter an essay competition