Guaranteed Way To Get Those 1300 Points

[Xiao]

If this way does not work, then you need to level up your magic.

Simply customize yourself so that magnega and thundaga are on the shortcut menu.
At the beginning of the battle, cast magnega, then cast thundaga till everything is defeated.

I tried for hours to get those points, then I found this tip and beat it instantly.


Edit: P.S. Sorry if this tip has been posted on this forum already...