Consider this site my personal compendium - an informal source of notes, problems, solutions and everything else in between to help students advance their studies, as well as a public medium through which I can share my various ideas and the occasional useful insight.
Here, I share materials ranging from mathematical olympiad notes and solutions to handouts in physics and chemistry, undergraduate mathematics notes, project write-ups, interview questions, opinion posts and various other pieces that need to be dumped somewhere.
Of particular demand on this site is the beginner's guide that I have written for students preparing for mathematical olympiads (pdf).
I regularly maintain a compilation of my favourite interview questions, particularly pertinent to quantitative finance interviews (pdf).
I'm always open to hear from anyone! The best way to reach me is at krish.nigam@princeton.edu. I can also offer (free) mock interviews, mentoring, or just broader advice, so feel free to reach out if that is of interest!