The fact that you are required to incorporate quotes into your analyses (where applicable) implies the need to memorise those quotes. Memorising and thoroughly knowing appropriate quotes subsequently implies the expectation that said quotes are expressed exactly as they are written in the text from which they were sourced. I believe that if you find yourself unable to remember exactly how the quote is written, minor modifications to a particular quote, such as 1-2 words written differently/changed completely may not be penalised. This is provided that the meaning conveyed by the quote remains the same. Consider the following example:
- Original quote: "What may not be expected in a country of eternal light?"
- Modified quote (how the student remembers it): "What might not be expected in a country of eternal light?"
As you can see, the change from "may" to "might" here doesn't really change much in the meaning of the quote, meaning the student's analysis of this quote will remain the same.
Major modifications to a quote are more concerning as they might result in the meaning conveyed being completely changed, resulting in a misquote. This may also have repercussions on the student's analysis of the quote. In the case of a misquote, I believe marks will likely be deducted. This effect will be more severe if the analysis was impacted by the misquote, resulting in the student possibly no longer answering the question appropriately. Consider the same example given above:
- Original quote: "What may not be expected in a country of eternal light?"
- Modified quote (how the student remembers it): "What might have not been common in a country full of eternal light?"
As you can see, the effect of the modification here would likely be much more significant. It would therefore be safe to ensure you remember and express quotes just as how they are written in their respective texts.
I hope this helps!