First to get into the border patrol you must sign up at the website for the border patrol
http://www.cbp.gov/xp/cgov/home.xml You must then schedule for the test. The website suggest you review the study guides provided before attempting the test.
The test takes 4 and a half hours to complete on average and contains 3 sections. Logic and reasoning, Spanish language, and an assessment of your work experience.
After 4 to 6 weeks you will receive your test results in the mail. If you pass you will have an interview. You must also pass psychical tests, drug tests, and a background investigation.
After all that your name will be put on a list and when a position is needed you will be made an offer.
Thats the basics for getting into the border patrol.