You've got options.
1 contact the landlord and complain
2 contact the university and complain, via university housing service (look on website for a neighbours liaison or mediation service)
3 contact the Council and complain (Environmental Health for noise, mess; Private Sector Housing for tenancy breaches such as nuisance, overcrowding, etc)
4 tell the students (via a letter through letterbox - keep a copy) that you are complaining, and to knock it off
5 if you feel intimidated, or there is drug use, rowdiness, fighting etc, don't be afraid to ask for a police visit. We've had students dealing class A drugs in our road. They're not all ingénues
6 keep each agency informed about what the other knows / is doing. They don't do this automatically.
7 pray for the end of June 2019
Good luck.