What are some Extension Activities for ELA on Practice Test Days?

This question has been lightly edited by Edutopia staff for clarity.

We are practicing Standardized tests once a week. Sometimes we do IXL and/or No Red Ink. We have some GATE students- iReady is too easy for these kids. I have 9th and 10th grade and we work at a STEM Magnet school. I don't like "teaching to the test" but this school does a lot of AP exams, and the expectation is for them to do well in all kinds of tests...it is embedded into my planning- one or two students are very quick with the reading and score well- I want to keep them engaged while the rest of the class catch up. THANKS!😀