I want to understand and improve working qualities of my personnel and i will be conducting a test nex week. But i need to know how to conduct it properly?

I think you can find anything on the Internet. As for the tests themselves, well, ask some questions and so on. I can't tell you how it all works, because I've never done it before.

One of the most important and effective test to gain knowledge is to conduct 360 degree effy.ai/blog/360-degree-feedback-example as it shows strong and weak sides of your employees. In order to do this i think you need to search for templates and examples. Here are some tips: ask open ended question, ask workers on what their skills can add to improve the proccess etc. Try to read more, and you will understand everything. Good Luck