Leftist bias is all over the curriculum and it was done on purpose.
I picked this out ...
"He admitted, Pre-testing is very counterintuitive, but claimed these pre-tests, which a majority of students fail, help students get higher grades on final exams."
and felt I had to remark;
I don't know when it started, but for as long as I can remember, when I got my books at the beginning of the school year, I would READ them in the bathroom (my library)
I had read all my books (even math) by November or so.
Subsequently, I did little study through the year, just brush up reading and was a basic B student.
I was happy, my parents were happy and I had a lot of time for girls, sneaking cigarettes and going to church dances