Newsbeat has had access to Abersychan School in Pontypool where domestic abuse classes are taught, despite them not being compulsory in the UK.
Last week the mother of 21-year-old Hannah Fisher, who was killed by an ex-boyfriend, said awareness lessons should be taken in all classes.
The Department of Education says it is up to schools if they want to teach these classes.
PC Juliet Murphy from Gwent Police is delivering the Safer Relationships lesson to a group of students aged 15.
Follow @BBCNewsbeat on Twitter