Level 137 is similar to a conveyor belt. Getting the ingredients to the far left of the screen requires you to constantly drop them through each portal. Try to always swaps candies left (not right!) if possible and always try to play with the candies beneath the ingredients you need to drop. Be aware that if you get a candy blocking the right drop point, like shown in the image, you can get it to drop one block right if you remove that candy (or in this case liquorice). This is important to know.