Please follow this adsense settings steps shown in video(turn off Interest-based Ads)
Step 2)Section targeting :
Section targeting allows you to suggest sections of your text and HTML content that you'd like us to matching ads to your site's content. By providing us with your suggestions, you can assist us in improving your ad targeting.
To implement section targeting, you'll need to add a set of special HTML comment tags to your code. These tags will mark the beginning and end of whichever section(s) you'd like to emphasize or de-emphasize for ad targeting.
<!-- google_ad_section_start -->
<!-- google_ad_section_end -->
You can also designate sections you'd like to have ignored by adding a (weight=ignore) to the starting tag:
<!-- google_ad_section_start(weight=ignore) -->