Profile evaluation with GMAT 710

Hello.

Need help in evaluating my profile. I am having a GMAT score of 710 (AWA 5.5), with 3 years of work experience in semiconductor manufacturing industry. Have been working on product specific tools closely with top customers. Have visited customers thrice onsite and have a decent profile. I have decent academic performances.

Extra curricular activities:- Have been a part of personality development training over the past 1 year and have just enrolled in an NGO.

I am looking for a full time MBA program in the top 20 B-schools. Please let me know where I need to improve in my essays and what are the strengths that I could highlight.

Also could someone let me know my chances for the top 20 B-schools across the globe.

I am mainly looking for a career shift into marketing/sales.

I am looking at applying to B-schools like:-

1. INSEAD

2. London School of Business

3. Queens Canada

4. University of Toronto.

5. NUS, Singapore

6. ISB, Hyderabad

7. Cornell University

8. Kelloggs

9. CEIBS, China

10. IE Business School, Spain.