Do internal candidates usually get the job?

It is likely for internal candidates to get the job. As long as they answer their interview questions effectively and show that they have the appropriate skills in their application, internal candidates are at an advantage. This is because companies tend to look for internal hires before reaching out to others, so there are less people applying for the job.

That being said, internal job listings can still be very competitive, especially for high level positions. Make sure to prepare and don't take for granted that others at the company are doing the same.