This is episode 52 of 70 of Math Prodigy from Nowhere. Play it below, then continue straight into the next episode — the whole season is free and needs no account.
The closing stretch of the season, where the arc pays off.
Jiang Ping, a poor vocational student with a math gift, overcomes obstacles and prejudice with her teacher Zhang Zhenzhong's guidance, wins the international math Olympiad, proves her worth, earns respect, and changes her and her family's fate.