Note:multiple factors can influence the speed results.
This his how you can get the most accurate results:
Connect your computer using a network cable (UTP-cable) that is directly connected to your modem.
Make sure no one else is using your internet connection when your are testing the speed.
Make sure no background services on your computer are using your internet connection.
Update your virus and malware scanner to make sure this is not slowing down your internet speed.