This test shows how an antivirus behaves with certain threats, in a specific environment and under certain conditions. We encourage you to compare these results with others and take informed decisions on what security products to use. Before buying an antivirus you should consider factors such as price, ease of use, compatibility, and support. Installing a free trial version allows an antivirus to be tested in everyday use before purchase.
The AV labs try to fool malware and malware creators try to fool AV labs. I think that @Adrian Ścibor and Malware Hub testers can say something more about this issue than I could.