Hi my boy is in K2 now. He can read and spell quite a number of words. No problem reading books for his age.
As for maths, I think counting to 20 is definitely not enough. My boy can count to hundreds and he is exposed to thousand too. He can add and subtract for numbers up to 100. He does this by doing the long working method.
As for time table, counting in 2s, 3s, 4s and 5s is ok for him. He doesn't know division yet