@Aman Srivastava: I'm sorry to hear that you're unhappy with availability of this information on your device. Although it isn't quite as convenient as you'd like, you can swipe from the top of the screen to the bottom while Wi-Fi is enabled > Tap the word 'Wi-Fi (not the symbol above) > Details > Tap the cog to the right of the connection, and view the network speed from here. For Mobile Data, the quality of the connection is displayed in the top right corner, in the Status Bar.
For data usage, please head to Settings > Connections > Data usage > Mobile data usage.
