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Most schools do not do a IQ test, although it’s not unheard of. Coding schools and bootcamps are at an interesting crossroads in terms of disrupting the education system. Most do not require pre requisites for application, but still need to suss out the applicant to try and decide who will be successful in the program and who will not. And by successful, I specifically mean that code schools have to find students who have the passion and the grit to stick it out. Programming is hard, it takes a lot of brainpower, and you don’t want to sign a bunch of students up for a program that they won't be able to finish. That being said, schools have to get creative in how they find the right candidates. I’m not convinced that IQ tests are the best way to do it, but maybe they can give some insight on how the candidate problem solves. I attended Holberton School, and they take a little different approach. The application was project based, and allowed the candidates to interact with one another to problem solve. This fostered community, and also allowed the school to see who was a team player (a key component of the school).
No IQ / personality tests are not common.
There is usually a behavioral phone interview and a technical assessment. The phone interview is to get to know the applicant better as a person and learn their motivations for changing careers. The assessment is to test logic and basic programming skills.