Scrap starting lessons on the carpet. Hit them with something timed, at their tables, that they can do but which slightly stretches them so they don’t get bored before you’ve even started. Make a competition of it (doesn’t have to be the highest attained, can be the one who’s made the most progress so they all have a chance). I’ve taught year 3 a lot and they always make slow progress in the autumn term as they get stupid amounts of support in Y2 for decent SATs results. It’s very annoying.
Other things:
Don’t engage in any crap that diverts away from learning. Ignore anything that they’re doing for attention.
Hit them hard with rewards and sanctions. Follow through absolutely everything you say you’re going to do.
Have everything on tables ready for when they come in the room. To start the year I stick all their things in for them too to cut down on wasted time. I wean them off it eventually but it keeps them focused quickly.
Keep lessons very pacey as they’re still really young and get bored easily. Go outside! They’ll surprise you with how well they behave outside of the classroom. Any that ruin whatever fun thing you are doing are given a clipboard to do something else on for 5 mins until they’re ready to join back in again. Do short sharp things in the classroom to keep them keen and focused. A good one at the moment is for them to write something quick on a scrap piece of paper (which is already out on the tables), scrunch them up and throw snowballs. Pick up a few and share their answers. Could be ‘write 3 words that rhyme’ or whatever fits with what you’re doing.
Do not ever attempt to talk over them. Wait wait wait. I often write names on a post-it of ones I am waiting for and keep them at break so the others don’t get moaned at all the time.
When you do use the carpet, reward the ones who are ready with a chair to sit on. They all want to sit on a chair!
Give single instructions. It’s really dull and you have to work at it but it stops a lot of rubbish. E.g. ‘stand up’ and they just stand up, ‘tuck your chair in’ and then ‘turn to face the door,’ ‘walk to your place in the line. Any that ruin it lose a minute of their break (I pull them out very quickly so it doesn’t make a big deal of it so they don’t get the attention they’re after).
You can do this if you want to!!