Ah No! Rebus #231

If you're new to Rebuses, you can read how to solve a Rebus here (link opens in a new window).

Do you need a little help? Click to reveal a clue to the above Rebus.
Here is clue to help decipher the hidden meaning. A day of relief for many parents!
Do you think you have got it? Click to view the answer.
The words “School” are backwards, to give the answer: Back To School