@animepig turb0 translation, over 100 chapters. Barely decent read, i passed at around 40th chapter. Maybe i will come back if this manga gets cute heroines
edit: ah, sorry, that's webnovel, cant find ln either
@botodopo He doesn't even need to "learn" how to raise his level. He probably just needs to learn how to use his power better. There are no actual levels it seems, just that the government as their way of evaluating powers and assigning levels based on their criteria. The criteria are probably dumb too based on how these kinds of stories usually go, where powers that are easy to exploit are considered weak.
Spoilers for those who care about how he became unrivaled
He doesn't. He was strong from the start since he controls an authority the highest level for an ability. She lied so the MC wasn't enrolled in the army and instead goes to a school she know is somewhat safe