Is it possible to revise 4 topics before an international relations exam in a little under 24 hours?

So as the title suggests,I have my international relations exam at 2 pm tomorrow, it is now 3 pm and I need to learn enough about the foreign policies of three countries to be able to answer the questions in the exam we have 2 hours to write two essays, but we know the question for one of them so I have written and partially memorise a 900 word essay for that already.
I am only in first year which means that they are still quite lenient with marking especially in exams so would I still be able to get an okay mark? Bye knowing the key info and using some fancy vocab?
Any tips for learning a large amount of information in a small amount of time?