Is this additional information restrictive or nonrestrictive to my sentence?

Apologies if this is a dumb question, but I need it answering.

I have this sentence:

During my time at school, I volunteered to help assist a student in class in order to stay focused and not get into trouble.

Now, is the phrase "in order to stay focused and not get into trouble" additional information, or is it essential to the meaning of the sentence?

The sentence does, however, make sense when you remove the additional information, so does this mean there should be a comma before "in order to stay"?

Thanks.