My Bluetooth keyboard is not typing correctly Like the y key prints z

As described, you may have an English “qwerty-layout” keyboard configured a German “qwertz-layout” or vice-versa.

Check your keyboard layout in iPad settings - ensuring that you have set the layout that matches the physical layout of your external keyboard:

Settings > General > Keyboard > Hardware Keyboard -

Select the required keyboard layout; don’t rely upon “auto” settings.

QWERTZ instead of QWERTY means you probably have a German layout checked in Hardware Keyboard instead of US or ABC or British