don't even worry about how your examiner marks your paper, it's all very subjective. your examiner could read your essay after a REALLY good one, in which case they may mark yours more harshly. or they could read your essay after they've marked a REALLY bad one, in which case they may mark your essay much better than normal. and they may read your essay when they are really tired - so they mark it easier because they can't be bothered... or when they are really fresh - so they mark it harder... and then it also depends on the examiner's writing style and (if he/she is a teacher) how he/she taught their class... it's all too subjective... you just have to hope for the best!
I really have to disagree with this pretty fundamentally. It's inevitable that human bias will influence the assessor's, but this post gives off the idea that English assessor's are entirely sporadic, undependable and inconsistent. I'm also dubious that an assessor would penalise someone for doing things differently to how they teach they class. Assessor's for any subject attend an assessor's meeting before they start marking their first paper to ensure as much consistency and uniformity as possible.
Assessors mark holistically, relating student performance to the published criteria and ranking students over the full range of marks available. Determination of the mark is assisted by descriptors of Expected Qualities for the Mark Range; these have been written to reflect the level of achievement expected at a particular mark or mark range. The descriptors are only a general guide: they do not necessarily match precisely the performance of an individual response. Both the criteria and the descriptors are fully explored and directly related to the range of student responses during intensive assessor training before and during the examination assessment process.
Expected Qualities for the Mark Range – Section A
The extent to which the response:
9-10/10
-Demonstrates a close and perceptive reading of the text, exploring complexities of its concepts and construction.
-Demonstrates an understanding of the implications of the topic, using an appropriate strategy for dealing with it, and exploring its complexity from the basis of the text.
-Develops a cogent, controlled and well-substantiated discussion using precise and expressive language.
It'd be incredibly unlucky for a teacher to look at a piece that convincingly demonstrates textual knowledge, analysis, and excellent writing and then say "ah, I teach my students that they must have no less than seven quotes per paragraph, and this student has an average of five good quotes per paragraph. Their textual knowledge is lacking, they'll have to be marked down".
As an extension to the checks and balances already mentioned in this thread, the chief assessor (and I think some senior assessors) for each subject will randomly/sporadically mark papers from other assessors and give the assessor feedback on whether they are marking too harshly or too easily, and all the assessors know that they will be scrutinised on whether or not they are too easy or too harsh.
The marking system is very well run. Of course, there are always chances that human fallibility will factor into an assessor's perception of the piece, but them's the breaks. It's not down to luck and nothing to hope for. If you get a bad mark, your essay didn't hit the criteria and that's that.