This WhatsApp trick can save you a lot of time :

While there are many nifty features available on WhatsApp, most of them go unnoticed or you just don't know their applicability. Most WhatsApp users are likely to confine the usage to chats, status, and media sharing. However, there are many such features that you might not be aware of. One such feature is pinning the chats on top of the list so that you don't miss the messages from the contacts that are important to your phone.
Pinning a chat on WhatsApp is simple — you have to long-tap on a chat that will reveal the menu options for it on the status bar. Now, you will see a "pin" icon on the extreme left of the menu options. Tap on it and that's it. The chat will be pinned to the top of all the conversations on the WhatsApp chat screen. You can pin a maximum of three chats that you think are too important to miss.....