I am a student who has to do the diagnostic right now
1.The lessons are really repetitive
2. While doing the diagnostic if you realize you made a mistake you can't go back and fix it
3.It drags the fun out of learning and doing your work
4. Tho I found this unnecessary and annoying there are now learning games for math which was a new addition like a year or so ago but we are not allowed to do the learning games which are also to easy for even a fourth grader
5. I-ready sucks and is a giant wast of time