I have almost completed the course but instead of that it shows only 47% is been completed,while my friend have not completed that much but it shows to her 70% . Why like this?
you have to click on complete and continue.
present on the top right corner.
Then it will be counted as completed
Happy to Help 
This may be because you skipped last few seconds of the video. After the end of each video, the page is automatically marked as completed and next video gets started. So, you have to mark each section as completed manually. You can find complete and continue button at the top right of each section.
Thanks!
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