There are many essays to be written in the application and when they mean 1230 characters, they definitely mean it!
I wrote my essays by planning out what exactly I want the admissions committee to know about me - strengths, weaknesses, experiences and values. You want to convey to admissions that this is a person I want to invite to an interview because the responses were compelling and very interesting. Remember folks, that these committee members have to read a lot of essays... a lot. You have to find a way for them to stand out. Think about stories, use stories to convey who you are, what you did and where you want to go. In essense, each essay has to be concise, be part of the larger story that is consistent with your personality. Remember that the key areas of fit are:
1. Leadership (why do you value it? why do you think you are a good leader?)
2. Drive (are you driven? what experiences have shown this aspect of you?)
3. Contribution to class (how would you contribute to the class? what do you bring?)
4. Industry focused (are your aspirations to be a leader in the industry? how? why?)
5. Fit (why this school? why would you fit in?)
I think if you position your "story" that covers these points, you will be very strong in your candidacy. Remember that IMD also looks for a specific profile:
1. Strong industry work experience
2. Committment to leadership and long term learning
3. International experience and outlook
If you convey the overall story this way, I think you will have a great chance to score an interview.
Be bold in your essays and position yourself as an ideal IMD candidate.