In Candy Crush Saga level 513 you need to clear the jelly and score 50,000 points.
You have only 30 moves to clear jelly in this level and three double layers of jelly are in square in the bottom row which are not attached to the main board meaning they can only be reached by jelly fish, striped candies or color bombs. There are some jelly fish on the board, trapped under marmalade surrounded by candies trapped in licorice cages.
Start level 513 by unlocking the licorice jails, but make as many special candies as you can. A great way to win is to combine a striped candy with a jelly fish. If you are lucky enough for it to for a horizontal striped candy in one of those bottom squares then it will clear the whole row for you. A striped and wrapped candy near to the bottom of the board could be useful as well at removing lots of difficult to reach jelly. A color bomb can be mixed with a jelly fish to turn every candy it eats to a wrapped candy which could also be handy. There is some luck in the level as you need to be able to get special candies to clear the bottom row of jellies.
Level 513 does not need boosters. However, if the level is taking too long for you to solve then you may find that hjelly fish, color bomb, striped and wrapped candies at the beginning could be useful and a lollipop hammer could help remove jelly as well.