@Parul+Punj quite a common issue as WiFi signal strength is affected by the layout of your home and how it is built. If you have solid internal walls it is not uncommon not to have usable WiFi a couple of rooms away from the hub. Firstly make sure your hub is out in the open on a surface above obstructions like radiators beyond that you are into needing some extra WiFi kit.
Sky will sell you an add-on called WiFi Max which can comecwith up to 3 extenders see https://www.sky.com/help/articles/sky-wifi-max or alternatively you can buy your own home wifi kit which can work out cheaper in the long run.
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65inch Sky Glass, 3 Sky Streaming Pucks, Sky Ultrafast + and Sky SR213(white Wifi Max hub) main Wifi from 3 TP-Link Deco M4 units in access point mode
