How do we prepare interview questions?

1. By studying Books. 
2. Previous experience. 
3. Internet.
4. Getting help from other experts.

prepare well define questions based on technical and non-technical interview. Try to implement competency based questions to hired best candidates

1. Determine the type of job

2. Description understand the job description

3. Study Biography fully

4. questions of fact to determine CV

5. The questions must not be previously prepared there must be some kind of flexibility to facilitate the interview process