I studied and have went to school for border services, so I found the interview quite easy. The first step is a Object Recognition test, where they post 20 x-ray photos of baggage on a projection screen for 20 seconds each and you have to pick out if there is a gun, a grenade, a knife or nothing in each picture using a multiple choice sheet. They have a quick presentation before you start to show you exactly what to look for. The second part is simply an aptitude test. Most questions are spelling and grammar. There is some math, and some pattern recognition. You must have 80% score or higher on each part to continue through the process. At the end you have a short 5-10 minute interview If you successfully pass all parts, they invite you to your second interview later that week.