Clear Cache Partition in Lenovo A6000 plus
Clearing the cache partition is also good recommendation for speeding up the device. But it needs a little procedure and so follow it carefully before proceeding. In order to clear the cache partition, you need to turn off the phone and press the volume UP + Down button along with the power button simultaneously.
Now, select the wipe Cache partition option by navigating through the Volume buttons and confirm the selection using power button. Once the cache partition is done, reboot the phone and now the device will perform much faster than normal.
You can Check Step by Step process by Below Video guide