Zhu took the tests and get admitted, like the rest of his peers(Jiang, Hu, Wen, Li,etc) they're all true graduates from the best universities in China then, which explains why China made leaps and bounds under their leadership.

Xi is the only exception among them. Xi got in college without _any_ tests, purely because he has a powerful father then. It's said he could not understand a thing taught and there is no way he could graduate(or admitted). Indeed it's unimaginable for a 6th grader to take calculus in the top universities all of a sudden.

Xi even said he has a PhD degree, it's so laughable he had to remove that claim himself.

> Indeed it's unimaginable for a 6th grader to take calculus in the top universities all of a sudden.

Top notch private tutoring and some work ethic can work wonders in fairly short periods of time.

Corruption is certainly possible, but not the only conceivable possibility.

>he has a powerful father then

His powerful father made him a target during cultural revolution

He was at least studying for PhD in Law, according to Xinhua News Agency. I’m not entirely sure whether he ended up getting the PhD. The wording in Chinese is a bit ambiguous.