Econometrics needs you to have a thorough grounding in the aspects of probability theory and statistics and (but to a lesser extent) in linear algebra.
Good references for probability theory are to be found in the following web pages and course documents:
- London School of Economics course on Probability Theory and Statistical Inference - taught by Jeremey Penzer this is an excellent overall introduction to Probability Theory and key elements of statistics;
- The Cambridge Part III Maths course on Advanced Probability Theory is a very good but hard summary of all the main stuff you need;
That is all for now folks