You will get the most out of your ads when you put them in the right place on your page. Look at your page the way a visitor would and ask yourself where he would be looking to find what he wants from your page. Place the ad close to where the visitor's eye will naturally fall, but not so far down that visitors who only skim part of the page's content will never see it. You can look for the highest performing spot for ads by tweaking their placement and then using Google Analytics data to see which spot is attracting the most clicks.
Source : https://yourbusiness.azcentral.com/increase-google-adsense-income-17146.html