Norma isn't happy with her life. If she ..... (listen) to her mother's advice, she ..... (stay) at school and gone on to university.

Это условное предложение, в котором нужно правильно использовать времена глаголов.

Первая часть (If she...) — это условие, а вторая (she...) — результат.

В данном случае условие относится к прошлому, а результат к настоящему, поэтому нужно использовать Conditional III.

1. Глагол "listen" нужно поставить в форму Past Perfect (had + V3).
2. Глагол "stay" нужно поставить в форму would have + V3.

Получаем предложение:

Norma isn't happy with her life. If she had listened to her mother's advice, she would have stayed at school and gone on to university.

Ответ: Norma isn't happy with her life. If she had listened to her mother's advice, she would have stayed at school and gone on to university.