How Spell Mastery works?

I'm trying to guess how spell mastery points are gained.
This is: what's the better method to gain mastery points? I killed once a monster +3 levels than me, and gained no points, but then, killing a monster my level, I gained 2 points. Is it random or is there any kind of formula or something?

Thnx.
Comments
Random
So I can get mastery from mobs level 1 and from mobs my same level? Currently i'm lvl 6

I suspect the higher the difference, it's likely that random value involves some level difference variable/s somewhere.
Keep using magic and you will get there, just like others did
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