Complicated and confusing sums this level up best. If you can remove the chocolate on either side in the bottom half with one shot, go for it to clear it out of the way. To start otherwise, you need to put 2 shots into one of the pieces up top to allow pieces to flow dow to the bottom. Focus more on unlocking the locked pieces than the double Jelly, as its impossible to remove the spinners in the middle until you get to them.
Thanks to Matthew Dean
Patricia Frederick’s Tips on Candy Crush Level 120
Make any matches in the lower board first. Then vertically striped candy matches or a striped/wrapped combo should break up any chocolate and start clearing the rest of the jellies.