Hi Avleen,
I have seen other responses to your question, and I think I have something to say which might help you:
1. If you are going to put the psychometric testing to use by yourself? If so, you need to be trained to use a standradized test, which you need to buy a license for. There are several popular ones, as mentioned also by others above. Have you evaluated tests and chosen one?
2. Assuming that you have taken care of (1) above, then I understand that you want to establish cut-off scores. However, have you researched the scores of people who are already successfully doing those jobs? You might need to establish whether the psychometrically derived scores on selected factors are subject t correlation or causality. Again, assuming that you have already run the regression and there is significant causality, then you need to use the scores in your own pool and you would get the benchmark/cutoff score.
We are academic people here, not commercial, and would be happy to help you if you need to work more. Feel free to contact us.
Best wishes,
Team HRM For Non-HR Managers