Alchemy Sovereign with Divine Soul - Chapter 11

The whole world is subjected to a highly dangerous standardised exam called the Global University Entrance 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.

- Description from Novelupdates

A scientific genius named Thomas Harrier was transmigrated to an imperial prince body after a car accident that took his life. He found out that he is in a world similar to our own with a timeline akin to early twentieth century. The body that he is occupying was the imperial prince of a failing empire who suddenly rose to power after a successful assassination attempt of his father. Unaware that the attack is just the beginning of what is to come. He faces many challenges throughout. Will Thomas Harrier be able to live his second life in peace while running an empire and getting it back to its former glory? Or will he succumb into a conspiracy lurking within the country's borders?

Expect some:

Cold war era techs.

Super battleship with advanced electronics, propulsion, and fire control systems?
Helicopters?
Missiles?
Modern medicines and equipment?
AC-130?
A nuke?
Challenger or Abrams or Leopard?
F-4 Phantom or MIG-21?
Colored TV's.

Everything!!!

PS. Cover not mine, I just found it on google.

[Prince Regent VS Princess Chongxi, who will return with a cute baby after five years]

The regent of Tianxia Kingdom, who holds a heavy army in his hands, has power in his hands, and is not close to women, has been poisoned again, and this time he is about to die.

When everyone was worrying that the palace had no successors, a small group who looked exactly like the regent was sent to the gate of the palace.

Only then did they remember that five years ago when the Prince Regent was poisoned for the first time, the concubine daughter of the Yu family was kidnapped by her family to cheer him up.

Because of the same illness, she tried her best to detoxify him, but the day he woke up, she was persecuted by the royal family and disappeared mysteriously.

At this time, when a certain prince saw Xiao Tuanzi, his eyes darkened, “But your mother’s old love for this king is unforgettable, so you recognize your ancestors and return to your ancestors?”

Xiaotuanzi gritted his teeth and said: “No! In a few days, the little Marquis of Xichu will marry the eldest princess, who is my mother. My mother asked me to see if you are dead. Don’t die on the day she gets married. It’s bad luck. ”

As soon as the words fell, a certain tuberculosis prince lifted the quilt, scooped up the little dumpling, and strode out.

“Don’t worry, the king will not die on the day your mother gets married. After all… this king will go to snatch her.”

- Description from novelbuddy