can you get in by working hard?

Wondering if you can really get into oxbridge maths by working hard alone.

Can someone who gets A*s studying all day everyday for 1 month pre-exams get into oxbridge maths?

even if they do, would they survive rigurous uni maths or would they fall behind?

yes im talking about myself 👋. i saw some oxford maths interview questions and i feel like its purely iq based, hard to solve without natural talent