Hi I am currently a high school senior and want to study before I enter college.  I am from S. Korea, and came here about four years ago, and I am preparing to enter U of Illinois in Urbana Champaign.\n\nBasically I am going to major in Economics, and my focus is about 3 things.\n\n1. Economics(obviously... but could not take any course in my high school)\n2. Calculus(took AP Course but very shaky) \n3. Writing(4 years in the US, pretty good, but not great)\n\n     I am thinking about buying books and study them myself.  Do you have any suggestion for books or/and ways to study them?  Any other suggestions involving college life will be also appreciated : )
Math, math and math. Modern mainstream Economics is basically an aplied math course. If you get the math part, the concepts are fairly easy.
"A Random Walk Down Wall Street" would specifically address your needs with regard to math.  "A Random Walk Guide to Investing" is a good book and would suffice for most people, but wouldn't have the emphasis on math that you desire.\n\nPersonally, I like "The Only Investment Guide You'll Ever Need" by Andrew Tobias.  It too is a little lighter on the math than I think you'd like, but it gives a very good overview of the different kinds of investment vehicles available and what the risks vs. rewards are for each.  Of course, all the math in the world won't help you determine what your risk tolerance is; formulae can only get you so far.  This book helps you determine that, and risk tolerance is to a large degree what you should base your financial decisions on.