One thing to consider is that the best source of sample essay writing would be either your creative writing assistance department or, failing that, getting in touch with students that took the class the year before and asking for some help. Of course, you need to ensure that you use these types of samples for information only. There never to be used in place of your own written work. However, this is something that some students, in the rush to get things completed and keep on top of the course work, seem to forget from time to time.
An advantage of using sample essay writing is that you get to not only see how a particular style of essay should flow but you also get to see the mistakes that have been made previously. This will allow you to cut your learning curve quite substantially and ensure that you do not make the same types of errors. Granted, you may make an entirely new set of errors, but that is to be expected especially if this is your first time writing a particular type of essay.
One thing to remember when it comes to sample essay writing is that as a guideline only. Ultimately, you will have to use your own critical thought process to take what you deem as useful and make note of it and leave what you think is not. Remember, you want your writing to be just that: your own. Sample essay writing is good to use as a resource or reference but should never ever be considered for use as the final paper. Ultimately, if you truly want to ensure success, the best thing to do is to look it over with your teaching assistant or your teacher.