Certification- What Comes Next?

I was debating between classing this as a fifteen or a twelve certificate

A twelve rating would make sense because there is not much use of bad language and minimal drug use which is not made to look good in anyway in fact it is actively made fun of by the film. However these elements could be seen to be a big enough influence on those watching that the film would be classed as a fifteen as such displays of underage drinking and swearing could be seen as inappropriate for younger audineces

However looking at it objectively I think that the film would be classed as a twelve certificate for the reasons given above.