In exam idea ,there has written 1&2 in chapter 1 and 3&4 in chapter 2. What is this mean?

In exam idea ,there has written 1&2 in chapter 1 and 3&4 in chapter 2.

1.	In exam idea ,there has written 1&2 in chapter 1 and 3&4 in chapter 2. What is this mean?
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