I would strongly recommend to try not to quit mid-semester if at all possible. Doing so could possibly prevent you from being able to land another teaching job next year. From Texas AFT's website:
"If you are thinking about leaving your teaching position after the penalty-free resignation date, there are important things you should consider to avoid the mandatory one-year suspension imposed by TEA’s State Board for Educator Certification for “contract abandonment.”
They have some good advice to consider at their website:
If you can hang in there until the end of this school year, do whatever you have to to make the year work even if you do decide to leave. I was in a school once that was a disaster and I hated it more than any place I'd ever worked. It was a nightmare middle school that sounds similar to what you wrote about where you're at.
Two things that helped me were that by Labor Day of that school year I decided that I would leave from there at the end of my contract. That helped me to keep working towards a definite ending date where I could see that my time there in that position was finite and that everything I had to do to get through the year was temporary.
The other thing that helped was that there were some days where I taught general music lessons to my band classes instead of working with the ensembles that for me were less stressful which served kind of like pressure valve releases from the daily grind in which I found myself with that position. Not something I normally did at other schools, but I had to do it there in order to make it to the end of that horrible year. In my 35 years of teaching, that was the only year I ever had a terrible situation like that but I did survive it.
Like it or not, hellholes in our profession do exist and fortunately they are a tiny minority of the situations out there. I just happened to land in one that particular year. That might be the situation you're in this year.
In the end, you gotta do what you gotta do for your health and for your career. And as callous as this is going to sound, it's just a job. I did what I had to do to survive that situation. I hope you can do the same.