Review Detail of BlackHat in Practicing Basic Sorcery for Billions of Times Made Me Invincible

No variations in the power up, just MC training like an idiot for months getting random OP stuff which gives no sens of merit. Even worse, there's no consistency, whether it is in the power level names that keep changing (sorcerer, enchanter, mage,... not sure about mage but the first 2 are one and the same) or with MC's mentor treatment. MC's mentor has a huge wound that weakens him and will kill him. 1/ MC gets a potion that cures all wounds. 2/ MC don't want to give it to mentor because the potion that cures all wounds would only extend his life by a few days and might make him crazy. Because ??? 3/ MC gives it to mentor who's at death door and it can extend his life by 3 years. So why does it keep changing? If there's an excuse like "life energy can't be replenished", why does MC knows exactly how long that would extend his life while he has never learned anything about medecines/healing ? Moreover, so far all characters looks really stupid and stereotypical.