why do companies test you on your skills

a company just called me for an interview but told me the way the interview process works is you come in, then fill out an application, then you take a typing test, and 3 other tests. if you dont pass the typing test then you dont make it to the 3 other tests and you dont get the interview.

basically you have to pass all the tests before you even get to see the HR lady for the interview.

Why do companies do this???