My kids have found that they can easily run out of time on the ITBS.
The school our kids attended until their 8th/6th grades switched to the ITBS from the TerraNova during their last year there. My daughter did not finish several of the language sections which yielded a very low for her score of 69th percentile. For comparison, her Explore English score, taken the same year, was at the 98th percentile.
My ds has earned a math composite of 99th percentile all three years he has taken the ITBS despite his not finishing several problems on the computation subsection this year.
Their previous TerraNova scores are quite comparable to their results on their ITBS achievement test. This is true of the school average too which generally falls around the 75th percentile overall.
