Sun Liang did receive preferential treatment.
Not only did Niu Lianhua help Sun Liang choose questions, but she also guided his thinking slowly by looking at the answers.
That was how you treated your own child.
Actually, it wasn't entirely Niu Lianhua's fault, as the main Olympiad math problems were too difficult. Within less than an hour at noon, it was already impressive for He Ronghua, Lin Xiaoqing and others to complete three or four simple problems.
If the difficulty of the problems was increased, they could only stare at them, and they couldn't solve them even after a long time of pondering.
That was how Olympiad math worked.
Some children have received Olympiad math training from a young age and know how to think, so solving problems is relatively easier. For those who haven't received Olympiad math training, relying purely on thinking to solve problems requires a lot of mathematical ability, talent, intelligence, logical thinking ability, and even luck.