The gaokao has been a subject of Chinese cinema for decades. A short list of the best-known films gives you the tonal range.
《高考1977》(2009) dramatizes the restoration of the gaokao and the sent-down-youth generation. Formal, warm-hued, historical.
《青春派》(2013) is a comedy about a class of graduating seniors preparing for the exam. Lighter than the topic usually gets.
《全城高考》(2013) follows several students and their teacher in the run-up to the exam. Melodramatic in the good way.
《学区房72小时》(2019) is not about the gaokao itself but about the school-district housing market that surrounds it — a useful sideways look.
The Chinese-Indian co-production 《嗝嗝老师》 (an adaptation of Hichki, 2018) touches on similar exam-culture themes and has found a large Chinese audience.
Watch one, not all. And not the week of the exam.