During CST (California State Testing) should students be getting homework?

So my school has entered it's two weeks of CST testing. But all of the sudden my teachers are dumping projects, essays, and a bunch of homework on us at the same time. Is this even legal?! I believe it builds up stress. Is there any websites with info on this. Like the stress or the homework or something! I want to complain to my teachers to not give us this until later (like a week or two) in the year, but I need evidence proving giving us homework will decrease our scores in the CST.