iMac El Capitan How to mimic Ctrl+Home (PC keyboard)

iMac has a mini wireless keyboard.
No Home and End keys.

I found into Calibre Viewer the params to customize the shortcuts.
So I can mimic the Ctrl+Home and Ctrl End equivalent to PC world.

I did not find how to customize shortcuts into the calibre main page.
The idea is to send the cursor at the top/bottom in one shoot.

Under El Capitan, fn+Down Arrow jumps one page.
And Apple+Down Arrow does not jump to the end.

Any solution ? TIA