It was just the basic aptitude test. No interview was taken. Just prepare for subject of which you want to solve problems. Questions related to basic aptitude, maths, puzzles etc.

There is no interview per se. However they look at your transcript of records and they use that to determine which categories you can teach. So if you took a history elective you are more likely to be assigned history questions (if you apply for that). And I suspect grades play a role on whether you're accepted in general.