Recommendations for Preparation for Masters

I am heading onto my final year at a top Canadian university studying financial economics and mathematics (minor).

I have completed the advanced micro and macro courses and will complete two metrics courses in the upcoming year.

In terms of mathematics I've taken Calc I - III, ODEs, two semesters worth of linear algebra and will be completing real analysis and a combinatorics course as well. Additionally I will be taking an intro to stochastic processes course.

Is there anything else that would be recommended for preparation to do a masters? I am planning on applying to the MPhil programs at Oxford and Cambridge, as well as both the EME and econ Msc at LSE, with UCL as an alternative option as well.

Thank you all for your help!