If you're referring to reading comprehension, then I'd recommend readtheory.org. You start by reading a passage and answering some questions and then it alters the level depending on how many questions are answered correctly.
Homeschooling is going ok, by which I mean first months great, last few months terrible. Big sticking point is comprehension. My son seems very good at it, but hates it, should I persevere? What would be a good resource for a going into y3 level? Prefer a workbook or maybe online game I think, what the teacher is sending is not working.