Try to break down the 2 columns of double hit blocks so you can get to the 15 move bombs. Using vertical matches will get you there faster, so try to do those when possible. They will help you get to the 60,000 points you need, but remember once you only have 15 moves left (halfway through) you can ignore the new bombs that come in. Getting 99 green pieces is hard and you will probably need a color bomb and striped mix to clear out enough candy to make 99 green pieces.
Patricia Frederick’s Tips for Candy Crush Level 274
The easiest way through this level is a color bomb/GREEN striped candy combo. Use the bombs in as many specials as you can.