Almost all of the jelly is locked in here and it is all double jelly. Try to unlock as many pieces as possible early and make striped candies when possible to rip through multiple pieces at once. The more free room you have, the more likely it is to make a good piece to clear candy. You do have 4 jellyfish (2 in each corner), but try to save them towards the end when you have a tough square to remove the jelly on.
Patricia Frederick’s Tips for Candy Crush Level 251
When unlocking columns of candies, start at the top. When clearing columns of jellies, work the bottom–better still is a vertically striped candy match in the column.