The speed with which your laptop can communicate via wifi to your router depends not only on the wifi card in your laptop but also on the one in the router. Example: your laptop has AC, but your router's maximum is N. In that case will your router be the bottleneck. The second bottleneck is how many pieces of equipment are connected to this same router via wifi. All these pieces of equipment share the same bandwidth.
So, if you want to measure the maximum communication speed possible you have to place your laptop right next to your router, and switch off all other equipment that use wifi. Then you can run your test.
However, if the speed from your ISP to your router is lower than the wifi speed all of the above doesn't matter: in that case is your ISP your bottleneck.