My Trash Skeleton Has a Hidden Attribute Panel!

Transmigrated into a failing student's body, Lu Wu's new life in a summoner-dominated world seemed doomed. His initial summon? A pitiful, wobbly skeleton, mocked by everyone, leaving him abandoned by his former friends. With college entrance exams looming and his future in tatters, despair was a constant companion. But then, a game-changing secret awakened: a mystical system that revealed his skeleton's hidden attributes – and a mysterious \"Upgrade\" button. This was his cheat, his one chance to defy fate! Now, all he had to do was figure out how to activate it, because if he didn't, his future was over. Can this trash skeleton truly become a terrifying, world-shaking powerhouse?