Mage Manual - Chapter 406 - 339 Warning

The heavenly God of Warriors was betrayed by his true love and murdered at the very first night of wedding just because his merits made the monarch insecure. Reborn in a hundred years, Nie Tian would be an appendage no more. Reach the welkin, reverse the fate, reign over the heaven and reconstruct the worlds.

- Description from novelupdates

On a normal boring day, a message appears, inviting him to a Tutorial.

Born as the thirteenth son of the grand Kingdom of Ironhelm, Prince Liam is far from being considered a contender in the race for the throne. With his father, King Elijah Orlean, having only eight years left to choose the next heir, Liam’s prospects are slim. Seen as the boy with the least mana talent, he is overlooked by the court, his siblings, and even his tutors.But appearances can be deceiving. At just thirteen years old, Liam is secretly an Expert Mage, capable of wielding magic with precision and power that even the most talented in the kingdom would envy. Determined to keep his abilities hidden, Liam embarks on a path of quiet preparation, honing his skills in secret while navigating the dangerous political intrigue of Ironhelm.

The whole world is subjected to a highly dangerous standardised exam called the Global Examination. Answering questions by putting their lives at stake, they would live if they passed the test. Every month the exam will undergo reformation while, occasionally, it is random.