Before Root To Begin:
1. Make sure your mobile should possess 70 to 80% battery
2. Enable USB debugging mode (Menu (app drawer) > Settings > Manage Applications > Development > USB Debugging – check box)
3. Ensure that you have backed up your all important data.
4. Install Samsung Galaxy S Duos S7562 USB drivers. (Download USB drivers or download Samsung Kies (drivers included))

Disclaimer: Rooting your device voids will void its warranty.This root method is only for Samsung Galaxy S duos S7562 so don’t try on any other phone. Follow the tutorial as per your own risk ;)

Step by Step Guide on How to root Samsung Galaxy S duos

Step 1: Download and extract Samsung Galaxy S duos “Rooting kit“ on your computer.
Step 2: Switch Off your phone, take out the battery and insert it back. Now boot your phone into Download Mode by pressing and holding the Volume Down + Home button together, and then press the Power button till you see the Android Construction logo. Once again press Power button to confirm.
Step 3: Open “Odin.exe” (from extracted folder) and connect your phone via USB cable with your computer in download mode. If your phone is connected successfully the one of the ID:COM boxes will turn yellow.
Step 4: Click on “PDA” button and select file “recovery.tar” (from extracted folder).
Step 5: Please make sure that only F. Reset Time and Auto Reboot options are checked on Odin.
Step 6: Now, click on the Start button on Odin to start the installation process. Installation will take a few minutes to complete so please wait for the complete process.
Step 7: Finally, when the installation process is completed successfully you will see the “PASS” message on Odin and then your device will reboot automatically. When the phone boots up (vibrates) then immediately remove the battery and after 1-2 minutes start your phone. 
Hurray! Your Samsung Galaxy S duos S7562 now has been rooted and you can check the Super app installed on your device. In case, if you want to verify then download this Root Checker application and verify it by yourself only.
Wait! The guide is not over yet. You know which application is essential to install Custom ROM? No? It’sClockWorkMod and you can see this application when you are in recovery mode. And that’s its called CWM Recovery. So, if you want to install CWM Recovery then follow the remaining steps.
Step 8: Now, placed the “CWM Recovery file” in the SD card.
Step 9: Switch off your phone to boot into recover mode by press and holding Volume Up + Home button together, and then press the Power button.
step 10: From the recovery menu, select “Install zip from sdcard” and go to path where you have placed “CWM Recovery file” and select it. Installtion will take 2-3 minutes.
Step 11: When the installtion process is completed select “++++Go Back++++” and then choose “reboot system” to reboot your phone.
Now Your Are done Enjoy !