You can use the assessment label to search all of the posts on this blog that are related to the topic.
I've seen the sausage get made. I know how items are written. I've seen how they get selected for The Test. I've been to where thousands of student responses are scored at a time. These posts will give you some inside information on the whole thing.
- From Standard to Assessment: Item Writing
- From Standard to Assessment: Item Development
- From Standard to Assessment: Pilot to Test
- How to Build a Test
- What is "Rangefinding"?
And from my AP Bio teaching days, you can have a look at how those exams are scored.