i am about to pull my damn hair out with this kid

every single day that i pick him up there have been complaints of him not wanting to share, hitting other kids because he doesn't want to share, and not listening.
he is going to be 4 on Dec and throws the worst tantrums.
we talked all weekend.
i reminded him literally every hour or every time he misbehaved that we have to be good, listen, share, and no hitting other kids.

i just want to pull him out of pre school..
i feel like we are just wasting money when he doesn't want to listen or follow rules at school.

today we got home and he got spanked.
he will be in his room, no toys, no tv. and will only come out to eat and use the restroom.

i try not to spank because i want him to learn by listening. But I am at my wits end.
he didn't want to come home and i had to drag him out of there. one of the teachers helped me out because he was hitting me and scratching me.

i don't know what else to do.

IMO the whole going to your room and not coming out thing is a little severe for a 4 year old. My oldest is 4.5 and havent even thought about doing that. Just me.

Is it possible to take him later on maybe he isnt ready. Do you really have to take him now?

Try at home every time.you see him being good to point it out. Oh look you are sharing with me or something like that.

Tell them to try it there catching him being good can curb the bad. Getting positive praise my help.

I do this with DD. She is 4.

Spanking after the fact holds no ground and is confusing. Punishment or discipline needs to happen when the behavior happens. Or it does not make sense to the child.