You should never EVER use 'one click root'/'kingoroot'/'iroot' or any smiliar apps.
It's in most cases spyware, which you wont be able to remove completely (even after remove apk etc.)
If you did the only way is to reflash device.
1. Flash kitkat rom
2. Turn on device and turn it off
3. Flash TWRP using flashtool (lenovo-forums.ru/topic/4517-lenovo-yoga-tablet-b8000-twrp-recovery-dlya-b6000-wi-fi-i-3g-b8000-wi-fi-i-3g/)
4. Boot into twrp and flash SuperSU.zip (androidfilehost.com/?fid=961840155545568721)
5. Turn off device then reflash BOOTIMG and RECOVERY from orginal kitkat rom
6. Have fun with root