You need to take the exam but here are all the requirements http://www.arguard.org/arti/OCS/entrance.htm
Unless they go through OCS, never.
yes, you can go to college through the Marines. but afterwards you automatically HAVE to serve for 4 years i believe
No they do not, but if someone wants to switch branches into the marines they must go through marine basic
Yes. To be a "cook" in the Marines you enlist, go through boot camp, and they assign you your job. They will give you a test to see what you would be good doing, and promise you what you want to hear, but it doesn't mean you will end up where you want. If you want to be a chef the Marines is not the place to be. Go to a culinary school to be trained.
They go to Ft. Benning for the Army Airborne training. There were a few in my class.
do marines go to training on Sunday
Boot Camp is currently 13 weeks.
No. Marines that go to dive school do so through the Navy.
It seems likely that you could (possible exception: conviction of DUI), but this is a question best directed to the Office of Naval Pesonnel.
Yes, you have to go through 20 different blood tests, all agonisingly painful. Each one makes you feel like you're about to die.
You will need to graduate with a Bachelors degree before you can got to OCS. In some cases OCS will accept you while you are still in school.