Use 2 lightning spells on the highest level mortar. If they are the same level, then just use the two lightning spells on whatever mortar you want to put.
Remember, the town hall base you need to attack is level 6.
Send all of your wall breakers at any wall close to a defense and a resource storage.
Send all of your giants to the defense through the broken wall.
Send your healers to heal the giants.
Send your goblins to attack the resource(s) next to the defense(s) where the giants are attacking.