What if you got a job offer a week before going back to school for work?

Yesterday I finished an interview with a ABA clinic so I can begin getting my hours on becoming a BCBA. The school I work at they dont offer that oppurtunity even though we have BCBAS. I am still contracted with the school to return back. I start on August 13th with a professional development day.

Next week the ABA company I had the phone interview they want me to do a walk in interview with the clinic next week. If they give me the job to start August 17th whats the point of coming back to school just to be there for a couple of days. Not only that the school is a behavior school which means being miserable and exposed to violence again. Not good for my health. At least I will get paid.

Whats the right thing to do?