Cheating was rampant, and a very common way for getting admitted was paying professors from that uni for tutoring - who would train them on the type of tasks they would do at that uni.
And it prevented you from attending unis far away a lot of time due to time contraints.
And in the USSR, if you failed to get into the university, you were drafted into the army for 2 years.
He hated that, he wanted to be a lawyer. But he didn't get admitted to studies, so he had to pick something close in order not to be drafted, and so he stuck with it.