Follow this step to root your samsung galaxy ace 3 S7270 :
1. Driver USB Samsung must installed on your PC/Laptop, usually the CD driver bundle with on the box.
2. Activate USB Debugging on your device
3. Download this superSU flashable zip
4. Copy and paste the zip file on your sd card
5. enter to recovery mode galaxy ace 3 : turn off device then press VOL UP + HOME + POWER together
6. Choose install zip from sdcard – zip from sdcard – choose file “UPDATE-SuperSU xxxx”