1. Create a study plan. Try and do four subjects a day just so you can change it up as the day goes on. When creating a study plan you know that you have a set time to study and when you get through that time you can relax.
2.Rewriting things over and over again helps learn things.
3.Make minds maps for things such as people in histories containing your 12 main points.
4.Going to your local libary might help cause then your not allowed to talk and its free.
5.Think about it. Its only a month left and then you never have to study until 5th year.
Good luck :)