The most important thing which is worth noting is
" diet".
Prior to approaching exam in anxiety the most neglected part is our digestive system particularly petulence and stomach acidity is a major reason behind irregular and even sleepless nights.
So my best suggestion is to eat fiborous food, in addition to having a yougurt and banana in your diet.Eat food at its optimum timings and in case of depression, Wazzu (ablution) is the best thing that I observed in my life.( believe me I completed my whole preparation of CSS exam in 3 months only, and alhamdollilah I am satisfied, besides having no sleepless night in my single paper.Yeah, it was the most fabulous part of my life.Really owesome)just try this trick
The most interesting site that I would love to share is
http://www.greenmedinfo.com/
Just try to explore it.it has pathetically interesting facts related to our daily life medicinal problems.
I hope it will work.