GNU/Linux Kali Installing NVIDIA Quadro P600/P620 Driver Guide
How to Install NVIDIA Quadro P600/P620 Graphics Driver on Kali GNU/Linux desktop – Step by step Tutorial.
The NVIDIA Quadro P600/P620 Driver Kali Setup is Simple and involves only the Execution of few Basic Shell Commands.
Moreover, following the NVIDIA Recommendations is better to use the tested NVIDIA Linux Graphics Driver from the Kali Repository.
Then with the nvidia-settings Tool you can configure Brightness, Gamma, XVideo attributes, Temperature, and OpenGL.
Especially relevant, prior to the Driver Setup you may consult:

GNU/Linux Kali Quadro P600/P620 Driver Installation Guide