The units which are part of a step are selected by us to ensure that you have a good grasp of that topic/sub topic. However, for those who want to go further, we have the add more units option. Here, you can buy additional content which will get added to the same step when purchased.
I have already paid for the units in a step, why are there paid units in add more units? Print
Modified on: Tue, 25 Oct, 2016 at 4:54 PM
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