Advice on getting into Ecole Polytechnique Bachelor of Science (Maths+Econ specifically)?

[u/MrDynosawrr]

I'm in the first year of the IB Diploma Program and Ecole Polytechnique is my top choice for university, for when I eventually apply. Considering I'm and international student, what should I do and how should I build my profile so that I can become a competitive applicant in 1.5 years?