There are two things you can/should do:
1. Search Console Settings
In Google Search Console, help Google understand how it should treat different get parameters. More often than not Google will get this right, but there's no harm in providing additional information, so long as it is accurate.
If the get variable is for tracking purposes and or doesn't affect the content on the page, set a canonical to the version of the page you would like Google to serve. If the content is paginated and the get parameter specifies page number or limit, set the canonical to point to the "All" page. If an all page doesn't exist, you can specify previous and or next as well as a canonical, but be sure to not set the canonical to just the first page of results. More on this can be found here.