What do you wish someone told you when you were in high school about working in investing?

I wish someone had told me how important it was to pursue a MBA. If I had known this, I would have taken my college courses more seriously. In order to get into a good and reputable MBA program, you have to have a high GPA.

I have a degree in business and I wish someone had told me that:
-A degree in finance or economics would have been an even better avenue for going into the investment industry (although I personally knew an Electrical Engineering major who became a successful portfolio manager. Guess what, he was great at researching investments in the industrial equipment sectors, etc. IT is also a great option if you couple that with finance or economics.)
-The importance of an internship in the industry
-The importance of math

I would also suggest that someone starting out think about:
-Striving for an MBA and/or
-The CFA Institute's CFA designation, which is highly regarded

I wish someone had guided me a little more on the college path I chose. Knowing now that I enjoy this environment, I wish someone had strongly suggested to get a degree in business. I received my degree in psychology, which does not apply at all to my daily responsibilities.

I wish someone had told me to save 10% of everything I earned. Only years later did I learn the magic of compounding interest.
No matter which career you pick, if you don't know how to save a percentage of your salary, you will have a far more difficult time getting ahead.
Good luck.