Tsugi no Koi no Kotae Nasai.

A single mother with a middle school diploma aims to get into Tokyo University to get her life back on track! Kaoru Hayashibara is a 31-year-old single mother who divorced her husband due to his infidelity and is raising her elementary school-aged son Jin alone. In order to get back at her ex-husband, she decides to take the university entrance exam and hires Minami, a student at Tokyo University, as her private tutor. Kaoru aims to get into the top university, Tokyo University!

(Source: Akita Shoten, translated)