Past papers are extremley good for revision and have been a trusty source of revision for exam takers. 

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Past papers are so good because they give you an insight into how the questions can be worded and asked, but not only that, you can find the past paper mark schemes so you can do the test and find out what are your strong points and which are your weaker points so you can work on them and see what the key mark points are for each topic .