Start by demolishing the centre candy bomb as quickly as possible.
Then, other candy bombs will start to spawn. However, do not care too much as your goal is to clear jellies.
The trick is to get the bomb in a position where can be destroyed, then make moves that remove the jelly on another part of the board. If you run out of good moves or the bomb counter gets very low, destroy the bomb. Destroying the bomb quickly will just result in wasted moves dealing with the next bomb.