My ds is just at the end of reception, about to go into year 1. They use read write inc for phonics. He can read full sentences, knows the alphabet, all of the individual letter sounds and is working his way through the set 3 sounds, and he can recognise quite a few of what they call red words, those that can't be sounded out using phonics. On the read write inc book scheme he is reading pink level books.
He can write short sentences and if you ask him to, he can write three to four sentences on a topic, with some encouragement (he doesn't like writing). Practicing letter formation is an ongoing thing.
Maths wise he can count to 100, knows number bonds to 10, and is working on to 20, knows doubling, odds and evens, more than, less than, and dividing something out equally.
Hes reasonably average for his group, doing better in phonics than some, not doing as well in writing as others.
If your child is going straight into year one, I would suggest a chat with the teacher/head as they might have some catching up to do, especially if you're not prepared to teach reading and writing at home.