First priority is to get down to the locked in bomb and take care of it. Try to bust through the white blocks in the middle or straight down through it with a vertical striped candy and let the chocolate run it over to disable it. Generally you will score points before you even start this level.
Thanks to Matthew Dean
Patricia Frederick’s Tips on Candy Crush Level 122
If you unlock the bomb at the bottom, the chocolate will probably cover it before you have a chance to remove it. Try to leave as many special candies on the board when the moves are finished to raise your score. (It’s not necessary to completely remove the chocolate to beat the level.)