Is this just my school

A lot of my peers are bellow grade level today in math our teacher was letting us play iready games and this kid sitting next to me was playing the cupcake game and had a problem that was like Ive lived for 24 years and my brother for 20 years I want a cupcake for every 4 years we've both lived and this kid couldnt figure it out multiple kids in my school are bellow grade level in reading I need to know is this a common occurrence because it seems odd to me that my peirs think I am a genius for being able to quickly solve the cupcake game or already know words in our next unit