Your best chance to beat this level is to use the horizontal striped candies to set off the mystery eggs, so you have to unfreeze them and then match them up, and hope for the best from the eggs. You really need a wrapped/striped mix or a color bomb/striped candy mix. 60 seconds isn’t a lot of time, you you really have to move fast here.
Patricia Frederick’s Tips for Candy Crush Level 237
The only thing to keep an eye on while unlocking the striped candies is to keep the chocolate from closing off the top so candies continue to fall.