I quickly skimmed over it, however I don't have a lot of time to comment on it ...sorry
God job. It's pretty good. However, you're not quite clear enough...
In the introduction, you state:
The perceptual sets are our predisposed predisposition to perceive the world according to our expectations. You've used the same word twice which means exactly the same thing, and you need to clearly define perceptual sets. You need to stress it's a theory, and that is not what the theory states.
The aim of the study conducted by the year 12 psychology students of Antoine college was to ‘examine whether context had an effect on perceptual set’. This sentences contradicts your previous definition in your intro.... although I may be wrong.
Also, I suggest you write your own aim rather than quoting, like:
"The aim of this investigation is to determine whether context has an effect on perceptual set"
(You need to define what 'context' means...)
"The study made use of the context in which the perceptual sets where shown, the perceptual image shown was that of an inconspicuous “B 13” image. " 'the study'? What study? Your study? Someone else's study? If you are describing your own study, you must instead use this information in 'method'.
(Also, you used the wrong 'were'.
I think you need to develop more coherency, as the only individuals which will be able to fully comprehend the nature of the investigation are people who were involved, or solely the author.
Remember: You should aim to write a prac report in a comprehensive or clear manner to ensure readers who have no prior knowledge on the subject or study will be able to fully understand what the study entailed. You should never assume that your reader knows as much as you do, and it should be your intention to inform them and keep them engrossed in your investigation.
Good luck! Hope it helped and hope I gave you the correct information. Feel free to disagree.