Amita,
I would suggest that you need to look at your Recruitment and Selection process. If I understand the underlying message in the above posting, you are just interviewing random people off the street as it were. You have no process in place.
That is not recruitment. I have posted here many times on this subject. Here again is John in Oz's 6 Easy Steps to Recruitment and Selection.
If you want the right candidate for the job, you only need 6 things:
1. A proper position description which sets out the requirements of the job
2. A person specification setting out what the successful candidate needs to perform the job
3. A rigorous selection process based on the PD and PS, to choose the top 4 candidates to interview
4. A targeted interview questionnaire based on the PD and PS, to ensure the candidates can do the job and can integrate into the company - no stupid, irrelevant questions that have nothing to do with the job
5. Well trained interviewer/s
6. A rigorous reference checking process
Place well worded advertisements or work with a trusted employment agency who will source the RIGHT type of candidates for interview.
That's all there is to it. No need to complicate the process. Remember the KISS principle.