Things we're going To use
» PC with internet connection
» USB Cable
» SP Flash Tool - Download it Here
» SuperSU.zip - Download it Here
» CWM for Tecno Camon C8 Marshmallow ported by Team Hovatek - Download it Here
How To Root Tecno Camon C8 on Android 6.0
» Save the SuperSU.zip that you downloaded to your phone's SD card
» Unzip the TWRP zip file that you downloaded and flash the recovery image to the phone using SP Flash Tool
» Now, boot your phone into TWRP Recovery Mode (by Holding the Vol Up and Power button simultaneously for 5 seconds)
» In TWRP Recovery, Choose install zip from SD card - to choose a zip from SD card use Vol up and down scroll up and down, then choose the Supersu.zip file from the root of your SD card.
Scroll to yes and install, after a successful flashing go back and reboot.
It is simple as that. You may download Root Checker from Play Store to verify your root privileges. After downloading, simply Install Root Checker, run it and you should get a success message after then.
All Credit goes to Team Hovatek.