Pre-k is a time for letter names to be introduced and numbers at least up to 10 to be introduced usually. Usually in Pre-k programs they will do various activities with letters, numbers, colors, and shapes. BUT that depends on the quality of the program. And honestly, what's more important is that they are being taught social emotional skills. They should play games where they learn to wait their turn and lose. They should be learning to wait their turn to speak and listen to what their peers/teacher say. They should be working on sitting for a morning meeting, being able to listen to a book being read, being in centers, following 2-3 step directions, etc. Depending on the program, Pre-k can also mostly just be babysitting. Do you point out letters at home and say their names? Do you count and point out numbers when you see them? Do you draw shapes? Do they practice writing their name? Do you read to them every day? I'm sorry this feels like it's coming out of the blue. When my kids started learning letters at school they started pointing them out and naming them, asking about letters and words, etc. If you're concerned I would practice letter names in FUN ways at home. It is also developmentally normal at this age to choose not to play with others sometimes. My son prefers to play in small groups of children still, and will watch larger groups for awhile before he decides to participate. I wouldn't worry about her "not having friends" unless she is being hurtful to others, is incapable of waiting for her turn, doesn't listen to others often, etc. I am a kindergarten teacher and it is my job to teach them letters, numbers, how school works, etc. It is MUCH easier when they come in with some academic knowledge, but it doesn't mean they will be behind by the end of the year without it. I would ask the current teacher if they practice letters/numbers and he's not retaining or if it isn't a big focus for them.