A couple of weeks ago someone mentioned taking the placement test at reading eggs.com to get an idea of reading level. I found a code for two free weeks and DD did love it. She maxed out the test and that got her onto level 8, which was far too easy. She worked her way easily to level 11/12 in a couple of weeks. (FWIW, It said her reading age was 6.5 years at that point which seems about right. I would peg her at a late first grade level. It looked like it did not go much higher.)
The code was super easy to find.
