How to Get Into a Job Interview

i had the interview at bloomberg, and i, in my opinion, totally bombed it. I mean, they were asking me very difficult math questions which i could not answer very well. So yet, basically the entire hiring process of big companies was a giant filter to keep me out, basically. And then some short time later, i got this interview with davidville. It looked like almost like a pree school, because David shared the office with a guy, fred sibert, who is a cartoon producer. He didn't give me any stupid brain teach or questions he asked me to write some code in p hp, like a week before and hand it to him at his leisure