I like to write up notes for things I am studying. The process of writing these helps me learn; the note is really just a byproduct of me putting something in my own words. Nevertheless, maybe someone finds these useful, so I will post some of my longer ones.
Oral Exam Notes
These are notes I made from textbooks while studying for my oral exams. Here is a list of topics I looked at.
Here are some final exam study sheets for courses I took:
Final Exam Study Sheets
Here are some other miscellaneous notes on things.
Misc. Probability Notes
(These are from the Minerva Lecture Series given at Columbia University, March 26-April 2 2013)