Hello, I am not expert in writing an essay but I have attended classes of essay famous teacher (bureaucrat). He told that most high priority causes, effects and remedies should be written first and then least priority should be written below that, and if an outline is in sentences structures then it will create the better impact on the examiner.
for example: Bribery is the most worst cause of the corruption etc.
2: Nepotism has increased the corruption in the country.
and the rest of the things in your essay will be assessed by seniors in this group.