Oxford Post graduation 2021


I'll be applying to Oxford for MFOCS and Cambridge for MASt Part III and I have 2 research projects from a good research institute in the country and one from college. I fulfill the requirement of a first class bachelor's degree and I'm the topper of my college in the Delhi University. I have done quite a number of extracurricular like volunteering at national NGOs and working for societies. I wanted to know what else should I do to get into Oxbridge for masters? Is a publication needed? And what are my chances of getting in?
Thank you.