increasing class proficiency

[ProToeRubber]

so im trying to increase the class proficiency however its not been increasing no matter the units i kill

can you not have a sub class set to increase the main class?

i did throw a lot of my starting classes away and re bought them at higher ranks and levels do you have to start fresh at one star to increase it?

[Pickleton]

For class mastery, it starts at 0 even if you pick them up at rank6, they'll just have better stats.
If it's a story/DLC character, they have no "main" class, so you will have to subclass them or those points go to waste. Once you subclass, that subclass gets all of the class mastery exp. So you can't make a mage, subclass warrior and get both, it would be a mage that's only gaining class exp for warrior.

[Sevrojin]

Both classes level at the same rate but advanced classes take more exp to increase.

protip get eveything to level 3 as it takes a really short amount of time then do the long grind after