Constantly dropping internet on El Capitan?
This fixed it for me:


System Preferences &rarr; Energy Saver &rarr; Battery Power: Uncheck “wake for network access”
System Preferences &rarr; Network &rarr; Advance &rarr; TCP/IP: Configure IPv6 – select “Link-Local only”


Found the above fix in the comments of this article: http://osxdaily.com/2015/10/16/fix-wi-fi-problems-mac-os-x-el-capitan/