Teaching Assistant applicants have rated the interview process at Caltech (California) with 1 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 100% positive. To compare, the company-average is 75% positive. This is according to Glassdoor user ratings.
Here are the most commonly searched roles for interview reports -
Depends on what you are interviewing for. Typically not bad if you have taken the class previously. Some roles do not need interviews, other roles can be more competitive -- like CS.