A very anxious exam
Most of us have been there a week before the exam, "why didn't I start revising earlier", "do I know enough".
This is a completely normal reaction, thousands of students go through this dilema every year. One of the most important questions that floods the internet every year is, cram or not to cram?.
Cramming by definition is to absorb large amounts of information in a small amount of time, which is common practice in students today, but what effect does this have on our memory, does the information sink in?
According to the University of California Los Angeles, it would suggest that the cramming itself is not the problem, the problem lays with the balance of study and sleep.
So to cram or not to cram? YES cram during the day till your hearts content, but avoid the energy drink fuelled all-nighters.
Soak it up
A study from Sheffield University examined how more than 850,000 people improved skills playing an online game.
This study came to the conclusion that people who did not play for a day between sessions actually improved there skills on the game, whereas people who had longer sessions on the game showed slower progress.
This can easily be related to exam preparation, as overall it's a study of how the brain stores information, from personal experience this system has always benefited me, the tool of choice has always been the timetable, keeping the sessions small and the frequency long.
Example: Monday and Friday, Biology 2 hours.
No matter how you prepare for an exam, you must find that system that maximizes your capacity to learn, it's trial and error there are many techniques to use. Mind-mapping, highlighting key points, mnemonics etc.