1. Download and extract the file.
2. Just copy TWRP folder to your sd card. do not rename or modify any file or folder.
3. Reboot to TWRP recovery
4. 1st back up your current rom. Just in case.
5. Wipe everything except external sd card.
6. restore this back up and reboot.
Your phone will have pre rooted stock ROM. It will be like turning the phone for 1st time.
You can always unroot the phone.
Download: Karbonn Sparkle V