ESSAY, how to do it properly?

Hi one more time!! I consider it is time to start... On the second of September will be my final exam... and I have to workout my writing skills...
If you click this link.. you'll find some tips to create a superb essay... or at least some points which should be taken into account...
http://cae-tips.blogspot.com.es/2011/03/writing-task-essay.html
http://elblogdelingles.blogspot.com.es/2012/10/como-escribir-un-ensayo-essay-fce-part-2.html
http://www.salesianosbadajoz.com/alumnos/Ingles/Opinion%20essay.pdf

I wish it could help you... I'll take a look tomorrow... right now... I'm exhausted...