It's supposed to be easy (12-18 is the oldest level and they only do multiplication and division facts, I think). The kids are supposed to be able to do it all with mental math and with speed.
I have read that the difficulty will increase as you go. I've also read that, although that happened last year, it won't happen this year. Go figure. I don't know which one of these things is true. I sure hope the challenge increases with accuracy. I guess we'll see.
You could always sign your kiddo up from home and put another age in to get the level kiddo wants. He could play from home after school on that account.
Level 1 is 5-7 addition to 10
Level 2 is 8-9 simple subtraction and two digit addition
Level 3 is 10-11 not sure (no kiddo in this level)
Level 4 is 12-18 multiplication (like 36X2) and division
My 9 year old was accidentally put into Level 4, which would have worked out just fine, but I didn't know that. I corrected his age (took him out of the 12 year old class and entered him individually as a 9 year old) and it brought him down to Level 2. Sigh!
Remember that this is computation drill and speed is also important (accuracy is the main concern, though). There are kids from Asian countries and other math-strong countries competing in their own age groups. Many of these kids are GOOD. Many are slower and make some mistakes. Each race is different depending upon who the kid happens to be matched up with for that race.
Have fun!