I’m looking for a recent school movie.

There is a movie that starts out with a dead schoolteacher in the teacher’s lounge. Later on some paramedics come but they refuse to take the body away as it was moved. It has kids in it but I’m pretty sure it’s more wistful comedy drama than anything else.
‘I was named after Darius the Great’ The only quote I can remember from the movie.
It ends with a red haired teacher in a checkered shirt sitting on the school roof talking to a kid about love.
It somehow reminds me of Fist Fight (2017), but it’s nothing like that.
Please help. I think it’s a 2019 release but could be 2018 or 2020.