What exercise should we do to write an excellent essay for UPSC?

Develop and maintain the habit of reading, writing, discussing and thinking.
There is no other substitute for writing practice. If you want to make it better, practice the writing of essays every week and get them evaluated so that you can improve your writing skills.
Do not exceed the word limit, as you will not get any credit for it.

Take care of following things while you are writing an Essay for UPSC

There should be a good flow in your essay.
Your essay should present balanced and comprehensive View
Strong Introduction and Conclusion (don’t give an abrupt end)
Good coherence and articulation
Quotes should be used according to the context. It should not appear as if it is being imposed;