I am Showing u to How to Root Galaxy Y
2) Now copy this update.zip file directly in your phone's SD Card not in any folder
3) Switch off your device and restart it into recovery mode using the following key combination
Volume UP + Home Button + Power Button
4)In this Mod..select the Second option with the help of the "menu" button...click on the "update_.zip" file.....
5) After the patching of that file, you will be back to the menu, and there it's written "reboot system now". Select it.
6) After the reboot, go to phone's main menu and if you are able to find the "SuperUser" App on it, it will simply mean that you have rooted your phone!
The Video Turtorial HERE-