[redsable]

I echo the comment below. Don't waste your time reading books with more than 5% new words. In fact, actually about 2-3 percent new words is the optimum target.

Go here to test your reading level: http://my.vocabularysize.com/select/test

Go here to manipulate texts:http://www.lextutor.ca/

Go here for more general information: http://www.victoria.ac.nz/lals/about/staff/paul-nation