If you are getting notifications from TeachPad, then your Mac is infected with adware. TeachPad is adware for Mac.
TeachPad changes setting in your Mac. First, TeachPad installs a browser extension in your browser. Then, after TeachPad hijacks your browser, it modifies settings in the browser. For example, it changes the default home page, modifies search results, and displays unwanted pop-ups in your browser.