It has all been mentioned before on this post. Basically, day one is only for written, multiple choice tests on basic math, physics... about 5 or 6 tests. Main issue apparently is time. Since they dont let u use calculator, you will have to multiply and long divide on paper and that takes longer than with a calculator. It has also been said that they are not looking for the smartest guy, they want someone who they can sit next to for a 10 hour long flight.
I believe there is no personal contact on this first stage.