Candle can be good for design or if you buy that type of candle with perfume it would be nice.
From experince of someone who got a lot of exams, i recommend you void meditation and getting out of your room to get ,,clean air" no matter how cold or hot is weather outside.
Divide the learning on 2-3 more categories and ,,bet" on which type of memory you know you have the best(visual,audio or sensitive). For example, i got an excelent visual memory so i rewrite the infos for exams on a new paper with a beautiful handwritting, if you have a good audio memory recite the lessons loud.
Sorry for bad english and i hope it helps you.