This is pretty straight forward, just keep matching the candies to achieve the amount needed. If you run short on a color, make some striped or a color bomb to clean up the board. All pieces cleared count towards the total. It is rather helpful to remove the blocks and spinners, but not necessary in the least.
Thanks to Matthew Dean
Patricia Frederick’s Tips for Candy Crush Level 126
Break the blocks to allow more candies to fill in. Make special candies to clear rows and columns instead of making just 3-4 candy matches.