My DCs went to preschool in the US. The biggest class any of them was in had 14 children, with a teacher and an aide, so quite nice. They went for 2.5 hours, three times a week. They were all four (real school starts at 5 in the US), and two of them were already reading. I could have sent them to preschool at three but I couldn't see the point of it. They were doing perfectly fine at home.
There were little round tables and small chairs for table work and they spent a little time every day drawing, tracing, colouring, 'writing', using pencils, markers, crayons, and glitter glue. They focused on writing their names and producing identifiable shapes. They also painted and made collages under the direction of the teacher. There was scissors work every day and the place was festooned with their artwork. They made craft items using toilet rolls, cotton balls, ribbons, you name it, following directions and learning left from right, terms like above, below, behind, beside, in front of, etc.
They spent time every day using clay and small toys, beading, lacing, shape sorting, pegboards, working on puzzles, making dough that they brought home to bake, and they also used blocks of various sizes and textures (giant cardboard blocks, wood, stickle bricks, duplo and lego). There was lots of counting of items in ones, twos, fives, tens, guessing quantities, figuring out what was heavier, simple science experiments using water, oil, food colour, ice, etc. They hatched butterflies and released them in the church garden. They grew plants in pots (basil and other herbs) which they then took home. Every so often, they went outside for a walk and brought back a few things to talk about and examine. There were toys for role play and a sand table and water table. Getting to play with the water table was the reward for being very co-operative.
They had circle time every day and show and tell every week. Show and tell was taken seriously and everyone had to listen politely. Once a week a parent or older sibling went to the class and read some stories to them while the teacher filled out the weekly evaluation at her desk. They discussed things like the season, the weather, the day of the week, what month it was, at circle time, and learned a few songs, some in different languages, e.g. a Christmas song in Norwegian, a Swahili work song, a Spanish children's song. The teacher read a few books for them every day towards the end of the session and they discussed the stories, with the teacher asking questions and the children encouraged to raise their hands before answering. There were often props to go with a story that the children could pass around and examine or even eat, like gingerbread
for the story of the gingerbread man (Jan Brett book).
It was very organised, with snack time and bathroom and hand washing at certain times every day. At the end of each activity time slot, the teacher gave a warning that they would be putting away their toys or materials soon and doing a new activity. They were expected to learn to transition without a fight, to put away their things in the right place and be co-operative. At the start of the day they were expected to take off their outerwear and hang it up neatly on their own hook and at the end, they had to put on all their own jackets, hats, scarves, gloves, snowboots, etc., without help. Since it was a Catholic parish school they had a few simple prayers to start and end each day and before snack time ('Thank you God for our school and our friends and help us to share', 'Thank you God for our food and drink and help us not to spill', 'Thank you God for helping us to learn today.')
I would have loved to send them to a Montessori preschool but alas it was too expensive. However, they loved going and the teacher was a kind and warm person. They were very well prepared for school etiquette for the next year.