to root this mobile there are couple of method you can try
1 try kingo root app its required internet connection, if not success try its desktop version
2. try kingroot apk avialable on xda
3 try farmaroot
4 install custom recovery via sp flash tool , for recovery file read back original recover boot.img and patch it with mtk droid tool, on xda there is given detailed tutorial
to root this mobile there are couple of method you can try
1 try kingo root app its required internet connection, if not success try its desktop version
2. try kingroot apk avialable on xda
3 try farmaroot
4 install custom recovery via sp flash tool , for recovery file read back original recover boot.img and patch it with mtk droid tool, on xda there is given detailed tutorial
https://veditto.com/root-android-6-0-smartphone
try above