Disable X-Server

sudo service lightdm stop

Install Linux-header

Get Kernel version by uname -a
Install header
sudo apt install linux-headers-4.14.0-kali3-amd64 linux-headers-4.14.0-kali3-common linux-headers-4.14.0-kali3-all

Block nouveau driver

echo -e "blacklist nouveau\noptions nouveau modeset=0\nalias nouveau off" |sudo tee /etc/modprobe.d/blacklist-nouveau.conf
update-initramfs -u && reboot

Check whether succeed or not
lsmod |grep -i nouveau
If without any output that means to succeed.

Download NVIDIA Driver from Official Website

Install NVIDIA Driver

chmod a+x NVIDIA-Linux-*
sudo ./NVIDIA-Linux-*

Configure driver setting

Get your graphics card 's BusID
nvidia-xconfig --query-gpu-info
Add the following code into /etc/X11/xorg.conf
sudo vim /etc/X11/xorg.conf

Section "ServerLayout"
 Identifier "layout"
 Screen 0 "nvidia"
 Inactive "intel"
EndSection

Section "Device"
 Identifier "nvidia"
 Driver "nvidia"
 BusID "Your BusID"
EndSection

Section "Screen"
 Identifier "nvidia"
 Device "nvidia"
 Option "AllowEmptyInitialConfiguration"
EndSection

Section "Device"
 Identifier "intel"
 Driver "modesetting"
EndSection

Section "Screen"
 Identifier "intel"
 Device "intel"
EndSection

Set up /usr/share/gdm/greeter/autostart/optimus.desktop And /etc/xdg/autostart/optimus.desktop
adding the following code.

[Desktop Entry]
Type=Application
Name=Optimus
Exec=sh -c "xrandr --setprovideroutputsource modesetting NVIDIA-0; xrandr --auto"
NoDisplay=true
X-GNOME-Autostart-Phase=DisplayServer