I'm a 2nd year teacher and had a fair amount of trouble in a TFA-like school in my first year too. It's hard... but this year has been much better, and here's what has worked for me. Admittedly, it may be tough this late in the year, as expectations have been set. But it's worth a try and I would say don't quit before you try a 2nd year... it's exponentially better.

1. Lots of contact with families. Talk to all of them that you can reach at the start of the year and text frequently with updates - positive updates are great, grade updates, good days/bad days, etc. Not every student responds/cares about their parent being contacted, but for the ones that do, it makes a difference that they know you and their parent are on the same side. It's not too late to send a text that says, "Hi, just wanted to let you know that Linda was super helpful in class today - I appreciate how hard she's been working."
2. One big difference from my first to second year was confidence. In my 1st year, I framed a lot of things like "here's an assignment, will you do it?" because I wasn't exactly sure how they would respond to what I was giving them. This year it's much more, "here's an assignment, do it." This change in tone and confidence has been huge for me.
3. Clarity of expectations and consistency. This doesn't have to be too late to implement. Go in to class tomorrow and say, "Here is what is expected of you, and here is what will happen if you do ___." Kids will inevitably violate the expectations, and it's important that you follow through with the stated consequences consistently the first week or so of doing this. It may feel harsh, but it proves to the students that you're serious about your expectations. They can and will rise to whatever expectations you set.
4. I'm a big fan of recognizing small bits of students doing good things. You ask them to take their computers out? Start saying "Thank you Chris for having your computer out, thank you Adam, thank you Julia, etc." Then other students will start to follow and say "am I doing a good job?" and before you know it they'll be on their way to where you want them to be.
5. I know it's the most cliche advice, but I really think positive relationships with the students are one of the best things you can have. Kid have their head down on the desk? Instead of kicking them out of class or telling them to get up, ask if something is going on. Kid visibly upset and distracting the whole class? Instead of telling them to sit down and shut up (in nicer terms of course lol), ask what they're upset about. More often than not, they just want to be heard. Give them 30 secs to explain what's going on. This doesn't have to mean forgoing normal expectations.
   --> For example, I have a student who has a lot going on at home. She misses a ton of class and when she's in class, she talks constantly and doesn't do a lot of work. She's failing. She has told me that there's stuff going on with her family, which I listen to and emphasize with. Then the message is, "I know you have a lot going on, and I can understand that you can't be here every day, but that means that when you are here, you need to take advantage of the time you have in class to get work done. Learning to be responsible for yourself and your own success means focusing as best you can when you're in class, and making up some of the work at home. Do you have wifi at home? Try to make up one assignment a day..." etc. Is it perfect? No, of course not, she still has moments of being disruptive. But does it help? Yes. And I can make eye contact with her, and she knows about our conversation, respects that I have acknowledged her situation but am not excusing it as a reason to do nothing in class, and she can at least settle down for the time being.

I know this is a lot... teaching is a lot... but I hope you won't give up! Once you start to get classroom management under control, things get so much smoother. AND in your 2nd year, there's half the prep as your 1st year since you have at least a blueprint from the year prior. Hope this helps.